I had switched to the PRTi from the PS 6.0 when I got back into tennis after being away from the game for a few years. Prior to the layoff I had used the PS for years and loved it. But when coming back and trying to knock the rust off for the first time I developed severe medial tennis elbow pain and grudgingly went to the PRTi. Great results. My elbow pain subsided and with time I found I could do anything with the PRTi I had been able to do w/ the PS, EXCEPT BOMB MY FIRST SERVE. I accepted the loss of first serve pace becoming more of a pitcher than a thrower, mixing more slice, topspin and kicks. Never experienced any wrist, elbow or shoulder problems. Stockpiled several and still have them. However I missed the feel and perceived precision of the smaller headed thinner beamed PS (whether real or imagined) and the very real first serve pop.
I wanted a more comfortable PS 85. Demo'd the N-Codes Tour 90, 6.1 95 and Yonex RDX500 mid. Results:
1) Tour 90: Expected a PS 85 type feel. NOT. Maybe it was due to coming directly from the much more comfortable PRTi but the 90 felt to me like a 12+ oz. cinder block. God bless the children, beasts and Roger Federer.
2) N-Code 6.1 95: Very similar to the PRTi. Great first serve pop. = on everything else. With a dampener almost a perfect match for the PRTi with that added 1st serve pop. Spin, power, control, comfort, etc. but missing the precise feel I was in search of.
3) RDX500 mid: The one for me. Just picking it up reminded me of my beloved PS 85. After adjusting for the immediate power drop off the ground I slipped into a familiar groove. To me this frame is the perfect blend of both the PS 85 and the PRTi. Comfort, spin, and (shockingly) large sweet spot of the PRTi combined with the first serve pop and precision of the PS 85. The feel is its own, but to me the mid gives reliable and consistent, albiet muted feed back. No surprises. It gives you, well....NOTHING. You get EXACTLY what you put into it. I like that.