So I just joined the club. Background is found here:
http://tt.tennis-warehouse.com/showthread.php?t=465483
My evolution to where I'm at today is pretty short and sweet:
Prince CTS Approach (1990-1994)
Wilson Pro Staff 6.1 (1994-2004) (Includes a long void from '96 - '03 of not playing much)
Wilson k6.1 16x18 (2005-2012)
Head Youtek Prestige MP (2012-2012)
ProKennex ki5 315 (2012-Present)
Got my racquets yesterday, strung up with Tour Bite (16L) mains @ 53 lb and N.Vy crosses at 55 lb. Went to the club last night and spent an hour and a half with the ball machine and plenty of serves. Whereas I had a real hard time with the demo because of the strings, having these strung with the same setup I'm playing on my ProKennex ki5 315 gave me a much better frame of reference.
First off, the power increase is noticeable. I definitely air mailed some balls into the backstop until I started to get a feel for it. While it's a head light racquet, the comments about it being "tip heavy" in this thread are spot on. I haven't played with a racquet I would describe that way and once I got accustomed to it, the feel became pretty natural. I started to get dialed in on easy balls. On balls I had to reach for, I quickly learned that a quick flick of the wrists on a stretched forehand had the same effect of the ki5 taking a full cut.
It's a very solid racquet at the baseline. A few mishits didn't twist the racquet much or result in much shock. I'll have to work on a little more controlled (shorter backswing) but aggressive cuts on short balls. Those shots are rewarded with heavy spinning balls that drive easily through the court. Too big a cut and I can see spraying them around.
Serving - wow. I think I found the 6.1 magic I had lost.
Volleys - it works well for me. I'm more of a punched volley with the occasional drop volley mixed in. I'm not a guy that makes a living off of soft hands, but I do well digging balls off my feet and half volleys. It seems like it serves me well there.
In short - if I can make some small adjustments to my baseline game to harness the power, I think I found my arm-friendly racquet that sets up points well for me off the serve, and allows me to played with some controlled aggression.