I agree
I've hit with the RDS001 mid (90") for 4 years and I feel like my technique if finally where I want it to be. I can top balls 4 or 5 feet over the net as easily as I can hit 2 to 3' over which is my natural shot. I play with Fed's grip on forehand and have a similar backhand motion as his. In the last year, my footwork has really improved, shortened my take back to hit out in front on forehand and i'm now jumping on any ball I can to hit off the front foot.
When I rally and hit relaxed, I've hit with 6.0 players and D3 college players. That said, my match play is terrible and through playing pushers realized my footwork lacked adjustment steps and my mind mental patience. I've used the RDS 001 to really learn to use my legs and hit most modern footwork moves. I can now hit comfortably with BLX PS 90 and on indoor it's killer.
That said, I'm still having problems with spinny advanced players who hit balls above my shoulder. Tonight, I tried the new APD and 2012 PDR and I killed a guy. I was surprised how my technique adjusted to these racquets easily and I can generate all the power I need off a long and fast swing mind you. I felt a type of control on angled baseline shots that I can't get unless I'm really on with a Fed type 90" racquet. That said, I'm less inspired to go to net unless my approach is excellent given less feel that I have for half volleys and hard volleys (soft floater volleys are easy on the babolats as well, just put your racquet out and guide).
The harder and deeper baseline had my opponents on their back foot more and with that I could approach deep and with the better angles to the corners. THat forced easier volleys. Put aways from mid court I could do with less perfect timing using just my arm at times with my hips facing the net.
I could see how using the Bab's would make me a less mechanically correct player over time, so I'll keep training with my RDS 001 and prostaff and use the babolat's for tournaments and league matches esp with advanced spinny players. I honestly think I'll win many more matches instead of giving my opponents a 10 sq in advantage in headsize and spin potential that I have to think alot about. Incidentally, hitting off the front foot with Babolats produced a bullet from the PDR and definitely more arc from the APD. I also found I could catch the balls late more consistently on the forehand and buggy whip easily. Loopy shots to the corners or service box were much easier than with a prostaff. I think Fed would win another grand slam or 2 with a Babolat, easily.
In sum, going from a control 90" racquet to Babolat improves your game and is not a hard switch (for me), but once I got used or get used to the Bab's, it takes awhile to get the mechanics clean again on a 90" low power (hitting out in front more, using legs, not cheating with arm only).