scotus' review of QLIPP Tennis Sensor

scotus

G.O.A.T.
Nice folks at QLIPP offered to send me a sample for review, so here I will make a series of posts in the next few days talking about what it is like to play tennis with QLIPP.

Feel free to comment, ask questions, and join in the discussion, anytime.

First, here is what you will get:
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Inside the box you will find the QLIPP sensor, a micro/mini USB cable, and a worm-type vibration dampener (which isn't necessary for operating the Qlipp but it's nice of them to provide a free dampener). You will need to supply your own charger. Your cell phone charger will most likely work just fine. I use my iPhone charger for it.
 
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A couple of items that will greatly enhance your experience are:

1. Tripod
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2. Cell phone mount for your tripod (or a mount for whatever device you will use). I picked up this one from fleabay for a buck or two.
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Now you are ready to use the QLIPP to its fullest. Here I have my iPhone 6S Plus mounted on my tripod and connected to QLIPP.

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As you can see in the photo provided above, the home screen of the QLIPP app is divided into 3 sections.

1. PLAY
You sync the sensor to your phone or tablet and play. The app will later give you data on your strokes. More on this later.

2. VIDEO

You sync the sensor to your phone or tablet, and video-record your tennis session. You can match the data analysis to the video. This is a great tool for finding out what you're doing great and what you need to change. More on this to come.

3. TUTORIAL
Just some basic info on how to use QLIPP. Not a whole lot there. You read it once and you'll never have to visit this section again.
 
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I've been using the Qlipp and the Sony sensor on the same racket for a few matches. I have to say, I'm really starting to get used to the Qlipp. (Still hate the fact that it does not have any internal memory and I have to have my phone/tablet logged into the Qlipp application to record the data). The best thing about the Qlipp that I like is the log of shots. If I have 300 shots, then I have a log of each shot I take. shot 1: Forehead 50mph etc shot 2: backhand 40mph etc shot 3: forehand 40mph etch and so on and so on. The Sony sensor does not give you this information unless you are in video mode.
 
I've been using the Qlipp and the Sony sensor on the same racket for a few matches. I have to say, I'm really starting to get used to the Qlipp. (Still hate the fact that it does not have any internal memory and I have to have my phone/tablet logged into the Qlipp application to record the data). The best thing about the Qlipp that I like is the log of shots. If I have 300 shots, then I have a log of each shot I take. shot 1: Forehead 50mph etc shot 2: backhand 40mph etc shot 3: forehand 40mph etch and so on and so on. The Sony sensor does not give you this information unless you are in video mode.

Thank you for chiming in. I have not had the pleasure of using the Sony, but I have used both Zepp and Babolat Pop. And yes, I also like the shot log that Qlipp provides.
 
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Here is what the Qlipp sensor looks like on a racquet.

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As you can see, the sensor sits on one side of the string bed, and on the other side you only have the plastic clip. This may look a bit awkward but it really does not bother me.

Another point that has been brought up by a fellow poster in another thread is that the sensor does not sit leveled on the string bed. Qlipp clips to the middle 2 main strings, and as you all know, the 2 main strings are not exactly parallel to each other from the side view because of the way the cross string is weaved through the two mains, going over one and under the other, thus creating an angle. So there are some downsides aesthetically speaking. Again, no big deal to me.

Then there is the difficulty involved in putting the sensor on and taking it off the string bed. In spite of the video tutorial provided on the Qlipp website and Youtube, I still find it quite a difficult task. The stiffness of the poly string resists the user's attempt to push the top portion of the sensor to get it past one of the knobs. One time I tried to switch out the sensor in between sets and I could not get it done. The positive side of this is that the sensor would not come off in the middle of your play. It stays firmly connected/attached to your string bed.

At any rate, take a look at Qlipps' video (Special thanks to paul500w for bringing this to our attention):
 
Before we get into the various (and fabulous!) data that Qlipp provides, I'd like to touch on a couple of issues.

1. LED light

On the bottom of the sensor is a blue LED light that blinks constantly. This can be quite distracting to the players on both sides of the net, especially at night. Like some other Qlipp users, I have had to resort to covering up the LED with a piece of black tape. I hope the LED light can be turned on and off via software. Perhaps the next firmware update could turn the LED light off after a successful sync.

2. Weight
The sensor weighs 8 grams, which is 4 times as heavy as a Gamma Shockbuster, my trusty vibration dampener. The weight may not be a problem for those who are not very sensitive about the weight and balance of their racquets.

I, on the other hand, use an extended 28-inch racquet, which makes even the slightest increase in weight in the head noticeably elevate the swing weight. The first time I used Qlipp, I put it on without taking my own dampener off the string bed, and it affected my strokes significantly. The second time, I took my Shockbuster off to save the 2 miserly grams, and believe it or not, it helped somewhat, although I still had to get used to the new swing weight.

So managing the added weight can take some getting used to.
 
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Location of the Sensor

Zepp and Sony place their sensors on the butt of the racquet. Pop goes on your wrist. I have always thought the best place to place the sensor was on the string bed where the dampener would usually go, and finally Qlipp made my wish come true.

The reason I like the string bed is simple. It would get you the most accurate estimation of the speed of the ball you hit. Whether you move your wrist actively or passively, the movement of the wrist (especially on the serve) makes a remarkable difference in the speed produced. For example, take some shadow serves with a babolat Pop on your wrist. Now take the Pop off and hold it in your hand and then take some shadow serves with your usual pronation or internal shoulder rotation or wrist snap or whatever you prefer to use. You will notice a marked increase in the speeds recorded on your Pop app.

That's the difference. Even with Zepp and Sony, which are attached to the butt cap of the racquet, I don't think you can get a closer estimation of the ball speed than Qlipp, because the placement is closest to where the racquet head strikes the ball. So I am quite convinced that Qlipp gets you the numbers that are closest to the true racquet head speed, based on which the most accurate estimation of the shot speed can be produced. Even in estimating the spin production and sweet spot targeting, I can think of no better place than the stringbed in which to place the sensor.

So even with the difficulties involved in putting the sensor on and taking it off the string bed and the changes in weight, balance, and swing weight Qlipp makes, I am very pleased that I have finally found a sensor that I believe gets me the best measurement for speed, spin, and sweet-spot hitting.
 
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PLAY

Here is a screen shot of the "PLAY" portion. It shows some shots I hit in a doubles game. I sync the sensor to my phone, leave the phone on top of my bag, and go play. No need to lug around a tripod for this. At the end of the set, I was greeted with this nice set of data.

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The log records what type of shots I hit and records the speed, spin, and how close to the sweet spot I hit the ball. The graph isn't all that easy to understand: the sweet-spot portion (the black graph) is intuitive, but the speed portion (the red graph) doesn't really match the numbers. I have come across some graphs where the graph for the speed matches the numbers well, and then some other graphs where they don't seem to match.
 
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Another screen shot, just to show that Qlipp can keep track of a lot of data, as long as it is sync'd to your phone or tablet. True, some of us would wish it had a memory card of its own, but then that would make it even heavier, so relying on the phone or tablet pc for data storage is probably better, given the technology available to us at this price point today.

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Some more graphs. You can click on the Breakdown button, and the App will show you a pie chart of what sort of shots you hit.

I am not terribly interested in how many forehands and backhands I hit. I know what my usual percentage breakdown is. But this may be of used to some others, perhaps some who want to change the percentage in a certain direction (e.g., hit even more forehands than backhands, etc).

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One thing I should point out is that I did hit more than 10 serves in this set of doubles, but Qlipp often mistakens serves for something else (in my case, forehand). So my forehand top speed of 94 mph (which would get me in the pro range) was most likely a serve speed. I will discuss this further later.
 
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Sorry, your picture is not showing on my screen.

I added the link as I couldn't get it to show on here. https://drive.google.com/file/d/0BzoSAEe7JYUSbnZ4czZDdjQ1WXc/view?usp=sharing - It's a little hard to see but it's starting to take a notch out of my strings and I don't like it. Yesterday I could not get the Qlipp on the strings, tried 10 times. either my fingers were slipping or the string would pop out from the other slots. So frustrated that I used just the Sony sensor last night at practice.
 
I added the link as I couldn't get it to show on here. https://drive.google.com/file/d/0BzoSAEe7JYUSbnZ4czZDdjQ1WXc/view?usp=sharing - It's a little hard to see but it's starting to take a notch out of my strings and I don't like it. Yesterday I could not get the Qlipp on the strings, tried 10 times. either my fingers were slipping or the string would pop out from the other slots. So frustrated that I used just the Sony sensor last night at practice.

Thanks for the new link. I see the crease now.

Getting the sensor on/off the string bed more easily is something Qlipp can definitely improve on for the next version.

I'm almost tempted to just have a racquet dedicated to playing with Qlipp, so that I won't have to move it around until the string breaks.
 
Thanks for the new link. I see the crease now.

Getting the sensor on/off the string bed more easily is something Qlipp can definitely improve on for the next version.

I'm almost tempted to just have a racquet dedicated to playing with Qlipp, so that I won't have to move it around until the string breaks.

The only problem with leaving it on is that you can't hook up the USB to charge it, at least not where I have mine.
 
The only problem with leaving it on is that you can't hook up the USB to charge it, at least not where I have mine.

Well, I have a bunch of longer USB cords from old cell phones that I could use to charge the sensor. Maybe you could also do something like that.
 
Well, I have a bunch of longer USB cords from old cell phones that I could use to charge the sensor. Maybe you could also do something like that.
The issue is that the section to plug into the Qlipp is too close to the throat and you cannot get a charger in there, the length of the cord is not the issue. I have been able to push the sensor up really far while on the strings and been able to get a charger in there, but I really don't prefer doing it that way.
 
Some more graphs. You can click on the Breakdown button, and the App will show you a pie chart of what sort of shots you hit.

I am not terribly interested in how many forehands and backhands I hit. I know what my usual percentage breakdown is. But this may be of used to some others, perhaps some who want to change the percentage in a certain direction (e.g., hit even more forehands than backhands, etc).

IMG_6077_zps9oxo4gou.jpg


One thing I should point out is that I did hit more than 10 serves in this set of doubles, but Qlipp often mistakens serves for something else (in my case, forehand). So my forehand top speed of 94 mph (which would get me in the pro range) was most likely a serve speed. I will discuss this further later.
Glad to see what the 'serve' section looks like. I am still awaiting a test-app from Qlipp as all of my serves are still reading as forehands.
 
VIDEO

This for me is the best part about playing with Qlipp.

First, a very important instruction: You need to turn off your phone's automatic shut-off function. The first few times I tried to videotape my serves, I would go serve for 10 minutes and come back only to find that Qlipp recorded only about a minute's worth of it.

Unlike your phone's native video app, Qlipp's video mode doesn't have the capacity to override the phone's energy-saving fuction and keep the screen on. So as soon as the screen goes to sleep, Qlipp stops recording.

So for iPhone users, this is the first step to take: Go to "Setting," then "General," then "Auto-Lock." Choose "Never."

Now, you're ready to use the video mode on Qlipp. If you have a friend or sidekick around to film you, great. For the rest of us, I highly recommend the aforementioned tripod and cellphone mount.

Sync the phone and Qlipp sensor, click "Video" and then press the record button. Go play!
 
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Here's a page of my serve practice.

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The first thing that stands out is that pretty much all my serves are registered as forehands. It doesn't bother me in this instance, because I know that those are supposed to be serves. But it would bother me if I filmed myself play a set rather than have serve practice. So Qlipp should look into this matter. Now with this problem duly noted, let's move forward to what I really like about the Qlipp video mode.

COACH YOURSELF
I've been a Talk Tennis junkie for a long time. I watch the pro tennis religiously, own most DVD instructions and watch a whole lot of instruction videos on Youtube. I know good technique when I see it, and I can easily tell from film if there's a deficiency in technique. But I've always been super lazy about filming myself. I always knew that there would be a huge discrepancy between how I think I play and how I actually play. Perhaps I did not want to find out how bad I'd look on camera. Whatever the reason, I never got around to filming myself until I got Qlipp and finally ordered the cellphone mount for the tripod.

Seeing myself on the screen, I could immediately see the glaring mistakes I was making. Just to share a couple, I noticed that at impact, I was bent too far forward at the hip with my upper body collapsing. Now I know that in subsequent practice, I need to try to keep my body more upright. Another thing: I always try to keep the elbow of my hitting arm up in line with both shoulders as I move into "trophy pose." But I noticed that immediately before I bring the racquet head down, I lowered my elbow, bringing it close to my ribs and taking it out of alignment with the two shoulders, and creating a hitch.

Now that I see the mistakes I make, I can work toward correcting myself. Seeing is so much better than hoping you've been doing things right.

SEE YOURSELF EASILY, REPEATEDLY, EVEN SLOWLY, WITH PERTINENT DATA
The Qlipp allows you to play the video in several ways.

First, you simply watch it from the beginning to the end. You can pay attention to your technique, perhaps even show it to a better player or coach for some feedback. But you're not simply looking at a video. As the video progresses, Qlipp will highlight the data according to the index to show that this particular portion of the video matches this particular shot in the log and you can see the speed, type of spin, spin level, and the sweet-spot accuracy. Awesome!

Now I have noticed that Qlipp can miss out on some shots and not record data on every shot. This is easy to tell, because if you play back the video, you'll notice shots on video that have not been recorded in the indices of the log. For example, let's say you've hit 20 serves, all of which you can clearly see on video, but Qlipp's log may only have 15 shots analyzed. Qlipp should look into this matter as well.

Second (and this is a really fabulous function!), if you don't want to watch it from the beginning to the end, you can simply click a particular shot indexed in the log. For example, you might say, "Wow, look at this one. Let's see how I hit a 110 mph serve!" You click on that line, and the video will immediately cue to that section and show it to you. No need to rewind or fast forward. It's instant, and you can see it over and over. Or you might say, "Wow, how did I hit that lousy 20-mph serve? I've got to see this." And Qlipp will show you that video instantly as well, and you can see exactly what you've done wrong.

Third, you can watch it in SLOW MODE. Let's say you think you've caught a glimpse of a technical flaw and want to take a closer look. Press "Slow-Mo" button and choose how slowly you want it played back. Then you get to see for yourself exactly what you did wrong.
 
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The issue is that the section to plug into the Qlipp is too close to the throat and you cannot get a charger in there, the length of the cord is not the issue. I have been able to push the sensor up really far while on the strings and been able to get a charger in there, but I really don't prefer doing it that way.

I see. Thanks for pointing that out.
 
The issue is that the section to plug into the Qlipp is too close to the throat and you cannot get a charger in there, the length of the cord is not the issue. I have been able to push the sensor up really far while on the strings and been able to get a charger in there, but I really don't prefer doing it that way.

Since they tested this for more than two years, they should have recognized the issue and made an L-shaped connector.
 
Thanks guys, I will use that technique next time I take it off. One thing is certain, it is very secure on the racquet -- a huge factor with a string mounted sensor.
 
Man, I am getting worried but the promising side is still strong. Hit for an hour with the ball machine with poor mixed results
  • 2 sessions the blue tooth just shut off after 3-4 hits and stopped recording the rest of the session. This made me regularly look to see if the light was still blinking in other sessions.
  • literally about half of my strokes are recorded as volleys (from both sides), frustrating when the Pop records them correctly.
  1. 65 strokes in session; Pop read 65 strokes (33bh, 32fh); Qlipp read 63 total strokes (16bh, 15fh, 32 volleys)
  2. 14 strokes in session; Pop read 14 (5bh, 8fh, 1 serve); Qlipp read 13 strokes (3bh, 3fh, 7 volleys)
  3. 27 strokes in session; Pop read 26 (14bh, 12 fh); Qlipp read 27 (10bh, 4fh, 13 volleys)
  4. 10 strokes in session; Pop read 10 (5bh, 5fh); Qlipp read 10 (3bh, 1fh, 6 volleys)
  • when it gets the stroke right, the spin seems very accurate.
  • still recording forehands for all of my serves.
  • Getting it on for me is a big problem, as pushing on the top while twisting ends up pushing it completely out, but I am hoping that is really due to my 14 mains and not the standard 16. I have found my cheat to get it on though, instead of pushing the top and twisting, I get it right to the point to twist, put then I hold the Qlipp firmly in place and basically pull the string over the little knob on the sensor. I have been able to do it that way very easily after much struggle the other way.
 
  • 2 sessions the blue tooth just shut off after 3-4 hits and stopped recording the rest of the session. This made me regularly look to see if the light was still blinking in other sessions.

Was your Qlipp in "Play" mode or "Video" mode?
 
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Tested mine today fort the first time. Something is seroiusly wrong with defining shots. I had 200 BH against a player that doesn't have a backhand...we mostly play FH. This was at 1 h 45 min session so I could have agreed upon 100 but 200? No way. I have a pretty heavy serve but 20 % > 125 mph...-no way again.

And then, the thing that I have missed out totally: The weight, 11 grams (gaget+damperer) sounds like nothing but it is all the difference! I have recently changed from Babo Pure Drive to Pure Drive Tour. It gave me a beefier hit and suits me perfect, I am not a spinner á la Nadal. The switch means an extra 15 grams. With the 11 gram gear from Qlipp it made the racket to heavy, slow(er) swing and I missed the crisp feeling I use to have. Called Babo representative and asked where to put 11 grams (did not mentioned Qlipp as they have their own systems play and POP) if I wanted a heavier racket - and I can say that it was definately not where the Qlipp is attached.

I can see that this is not in Qlipps interest to inform about but the fact must be clear to them as well. In the near future I think all rackets will have possibilities to be connected.

So, my Qlipp will be on the market tomorrow...:(
 
You can shave a couple of grams by losing the dampener. But I hear you. As for me, I am in the habit of playing with a dampener, so when I take my dampener off and put on Qlipp, I have a net gain of 6 grams on my racquet.

As technology advances, I'm sure the weight can come down. (Perhaps Qlipp 2.0 will weigh only 4 grams).

As for mistaking your FH for BH, I think Qlipp is looking into that matter.
 
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Aside from the pinging sound, the Qlipp's weight did not throw me off too much. I use the square Pacific dampener without the Qlipp and no additional dampener when using it, so the net gain is <8 grams. The position on the racquet is pretty neutral, as well.

One thing they might add is a charge indicator in the app. Maybe show the battery state at the beginning and end of each session. If I can get an additional session without blindly removing/charging/re-installing it would be a plus.

The readings are still a little hinky from time to time, but still could be useful in a directional way, even though not perfect in absolute terms. That said, I can tell this type of device will not reside on my racquet full-time, even after the kinks are worked out.
 
Haven't had that happen to me yet in "PLAY" mode. But I suppose it can.

Is there any chance signals can get confused when you have 2 sensors connected to your phone via bluetooth?
That would not make any sense. Even without Pop I get about half volleys recorded, and it is from both sides. I only have Play mode since I am on android and the video feature is not available yet.
 
That would not make any sense. Even without Pop I get about half volleys recorded, and it is from both sides. I only have Play mode since I am on android and the video feature is not available yet.

I had no idea that the video mode is not available on Android platform yet.

I've been a longtime Android user and just switched over to iOS. Glad I did in this case.
 
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So the Qlipp app updated today,and I got an email from Donny at Qlipp stating that the update should fix both the volley and the serve issues that I have been having. I will test tomorrow and hope for the best.
 
So the Qlipp app updated today,and I got an email from Donny at Qlipp stating that the update should fix both the volley and the serve issues that I have been having. I will test tomorrow and hope for the best.

Good. Please report back with your findings.
 
Talk about being quick on the draw! Not only have they already updated the firmware, but it includes an option to toggle the blue indicator light on and off and will provide a red low battery indicator if the flashing blue light is off . These guys listen to their customers and are crazy-responsive.
 
Talk about being quick on the draw! Not only have they already updated the firmware, but it includes an option to toggle the blue indicator light on and off and will provide a red low battery indicator if the flashing blue light is off . These guys listen to their customers and are crazy-responsive.

Nice. Do you have Android or Apple?
 
FYI, I just got my Qlipp not too long ago. Today I went out and hit a bunch of serves -- 187, according to the counter on the Qlipp. One of those shots -- just one -- registered as a serve. :( Granted, I'm a 3.5 player with not the best mechanics, but my serves are still serves (i.e., toss, overhead motion, follow-through, I do my best to do the trophy pose)! I split it into 4 sessions; this was my longest at 73 serves. I'm using the latest version of the firmware that allows the blue light to be turned off during play (thank goodness).

rZJmgBi.png
 
FYI, I just got my Qlipp not too long ago. Today I went out and hit a bunch of serves -- 187, according to the counter on the Qlipp. One of those shots -- just one -- registered as a serve. :( Granted, I'm a 3.5 player with not the best mechanics, but my serves are still serves (i.e., toss, overhead motion, follow-through, I do my best to do the trophy pose)! I split it into 4 sessions; this was my longest at 73 serves. I'm using the latest version of the firmware that allows the blue light to be turned off during play (thank goodness).

rZJmgBi.png
[/QUOT
FYI, I just got my Qlipp not too long ago. Today I went out and hit a bunch of serves -- 187, according to the counter on the Qlipp. One of those shots -- just one -- registered as a serve. :( Granted, I'm a 3.5 player with not the best mechanics, but my serves are still serves (i.e., toss, overhead motion, follow-through, I do my best to do the trophy pose)! I split it into 4 sessions; this was my longest at 73 serves. I'm using the latest version of the firmware that allows the blue light to be turned off during play (thank goodness).

rZJmgBi.png

E]
You are not alone, I have not had a single serve record at all in several days worth of use. Donny at Qlipp informed me that the latest firmware update worked on speed issues are too many people were apparently reporting too fast of speeds. He said that serve issues were currently being worked on, but I am kind of glad to hear/see that I am not alone in this issue.
 
Good. Please report back with your findings.
The firmware update did what it was supposed to do, but unfortunately that did not include serves. Donny wrote the following to me this morning after I reported back that I still had no serves showing up:

"There have been quite a number of teething issues and we have been resolving them one by one.. In this current Android version, we have resolved the issue of the blue light and the speed readings. Many have commented that the speed readings were far too high in the previous versions and this version is making it a bit more realistic.
We are currently at work with the serve detection issues."

I am with Chotobaka, the response is fantastic and I do trust that they are working on the issues.

Scotus, could you show a screen shot of the "compare" section? Mine has been blank since the first day and still just has dashes for my number of strokes.
 
It's weird...I'd think servers/overheads would be easy to distinguish between other strokes since the orientation of the sensor should be very different, but who knows, maybe there isn't a gyro or whatever inside the Qlipp to figure it out. I think forehands and backhands are off, too, regarding topspin vs. slice. I played two sets of doubles the other week and it thought I hit a majority of flat backhands when they were mostly slices.
 
The firmware update did what it was supposed to do, but unfortunately that did not include serves. Donny wrote the following to me this morning after I reported back that I still had no serves showing up:

"There have been quite a number of teething issues and we have been resolving them one by one.. In this current Android version, we have resolved the issue of the blue light and the speed readings. Many have commented that the speed readings were far too high in the previous versions and this version is making it a bit more realistic.
We are currently at work with the serve detection issues."

I am with Chotobaka, the response is fantastic and I do trust that they are working on the issues.

Scotus, could you show a screen shot of the "compare" section? Mine has been blank since the first day and still just has dashes for my number of strokes.

Ah, that makes sense. I'm sure it's gonna go through some growing pains. I also agree that the support from Donny and his team has been great -- mine took a while to ship and he was very supportive.
 
Scotus, could you show a screen shot of the "compare" section? Mine has been blank since the first day and still just has dashes for my number of strokes.

Not sure what you mean by the "compare" section. I don't think I have a section by that name on my iOS version of the app.
 
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