Tested it out tonight and here are my initial impressions:
Putting it on the stringbed was extremely difficult at first, but I kinda figured it out and can get it on or off in like 10-15 seconds now. Weight-wise I only noticed it when just swinging the racquet around without actually hitting. Once I hit a couple balls, the weight didn't really bother me at all, and I pretty much forgot it was even on there after a few minutes. I like the app and its layout. It's simple and the whole system/app/wireless connectivity works literally flawlessly. My only issues were with accuracy of its readings. It seemed like 4/5 times it would be good, and the other 1/5 it would be way off. When I was hitting forehands, the speed would be like "65...62...57...64...107" or "61...56...63...55...23". I had these same results on serves and backhands. I'm also not sure how it measures ball speed given it's probably based off of racquet head speed when there are so many different weights and configurations of racquets as well as varying amounts of spin and such. Also, it wasn't 100% accurate on what shot I was hitting. I remember having the volume turned on and was listening to it as it read off the speeds while I was hitting, and I remembered hitting a nice hard backhand, and it was like "85." Then I went to check my hitting and saw that that shot was counted as a forehand. I think this was pretty rare though as the ratio of forehands to backhands that I was hitting seemed about right. I was a little bit bummed that video functionality for Android isn't available yet, but I contacted the people over at qlipp and he expects it to be available by the end of the month.
Overall, I was very impressed about how well the whole ecosystem functioned, and I realize that most of the accuracy issues will be tweaked with updates like the Zepp and Sony sensors. I would recommend this product so far for people to give it a try, but I wouldn't be surprised if the majority of people wait till the bugs get sorted out.
Pros:
-Design
-Application
-Minimal effect on playability
-Price
Cons:
-Accuracy (will probably change in future)
-No video with Android yet (will change soon)