I really wish I had demoed these two racquets during my first go-round, but I was demoing through a local racquet shop and he doesn't carry PK. Anyway, on the face of it these two racquets are exactly what I was looking for: a little lighter than my current racquet (i.Prestige MP), but otherwise very similar: head light, control-oriented, and arm-friendly. Really, having both of these racquets to try is like an embarrassment of riches. If I'd just had one or the other, I would have happily chosen it to stick with and not thought twice about it. As it was, I had a terrible time finding enough difference between them to make a decision. I'm sure that if I'd been playing with one of them for a long time, and then tried the other, the differences would have been more obvious. Anyway, here are my observations: Groundstrokes: I noticed a little more pop on my groundstrokes with the Ki 5. I didn't feel that I was hitting the ball longer (I could still swing away), but there was more behind the ball. And for no reason that I was able to discern, I also felt I had a little more control with the Ki 5. With the 5g, I felt like the sweet spot was smaller, but when I hit it, I ripped the shot and it was smooth as butter, no "negative" feedback whatsoever. But I didn't think it was quite as forgiving on off-center hits. But we're talking about a very slight difference here. Volleys: I give the Ki 5 the slight edge on volleys. I don't know if it's a little more head light (and I'm too lazy to check the specs right now), but it seemed a tiny bit more maneuverable at net. Some racquets just make you feel like you're a little but taller or have a little more reach, and that was how I felt with this one. I wouldn't say it was as good as the RDS 001 MP that was my previous demo choice (that racquet is kind of the dream volleying stick for me), but I was happy with it. With the 5g I volleyed just fine, no issues either way. Serves: For some reason I felt I served ever so slightly better with the 5g. Fewer faults, though I wouldn't say the serves themselves were much difference. I didn't notice much difference in spin or power with either racquet. Since I've been playing doubles lately, I didn't really get to serve enough to make a statistically valid (relatively speaking) comparison. Comfort: Both of these are very comfortable racquets. Looking at the specs and the company literature, I was skeptical of the claims that the 5g is a more comfortable racquet, but I am convinced that it is true. I simply felt no vibration or shock at all when I was using it. With the Ki 5, I used a smaller vibration dampener than I'm used to but I did end up putting in a bigger one than the rubber gasket I started out with. (I always, always use one, and have gotten to where I can't stand to hit with any racquet without one.) So I used the bigger one in the 5g also, just so I could make a more equal comparison. Even though the Ki 5 did have more vibration than the 5g, it's still less than my i.Prestige or the RDS 001, two pretty arm-friendly racquets. My conclusion: Pick the 5g if you're predominately a baseliner, or if comfort/injury issues are your highest priority. I would also pick it if price was my biggest priority, because I just don't think there's $30 (or whatever the difference is) difference between the two. Pick the Ki 5 if you're more of an all-court singles player or a doubles player, or if getting a little more pop is your biggest priority. Now, if I can only figure out which of those categories I fit in, I'll be in good shape. A little about me: 3.5/4.0 female singles player, not a kid anymore, 1HBH (topspin and slice), currently playing 7.0 and 8.0 mixed and 7.5 and 8.5 women's doubles in the fall. I prefer singles, am a hard hitter with long strokes and a pretty hard serve and slice second. Tend to overhit, which is why I prefer a relatively heavy, control-oriented racquet. I previously went with the RDS 001 after what I thought was an exhaustive demo process, but in the end I gave it up after I just couldn't keep the ball in the court when I really went for a winner. Other than that, I have always used the Prestige racquets. Edited to add one thing (guess I didn't think this post was quiiiite long enough). WHen I first started hitting with these racquets, they felt bizarre to me. I had a Gamma worm dampener on them, and I felt like I didn't even feel myself hitting the ball. I switched to the rubber gasket dampeners and the next time I hit with them they felt much more "normal." In fact, I'm sure I'll have to adjust back to a "regular" racquet while I wait for my new racquet to arrive from TW. So if you demo one of these and they it feels too strange, give them another try. They definitely grow on you.