I recently started playing with the Ki5 315 and love it! It took a while to get used to, but now I think it's the best racquet I've every played with.
I get funny looks from a lot of people I play with, who aren't familiar with ProKennex. I have to admit I never would have considered a PK racquet if I didn't have arm problems.
So it's a little annoying that you can't buy them in stores, but the racquets (at least some of them) are top notch.
It's kind of like being in on a best kept secret.