Hey Solarflares,
I got the Rsi2's when I hit l90 as a TM, and found that very quickly they were great. Mid and long iron stopping power is awesome using a Nike l61 ball. After winning one TM tier tournament, tying for 1st (losing the tiebreaker) in 2 others within about 2 - 3 weeks. I was moved up to Legend even though my average was still just below 63.
Only problem I had as far as balls was with l90 Platinums. Distances were much shorter (about 5%) than the L61's if I was even slightly off ding. And with the 4.0 meter speed I was often a tad early. Never tried the Blacks.
I routinely play with the L61 Nikes and l33 Callys, and the only adjustment is to allow 2-3% more power with the Callys. I sometimes practice with a WGT G13-S. I shot a 6 under 30 on the front 9 of the new Best of Par 4 with that ball, and missed 2 makable birdie putts after misreading the greens.
I hedged my bets a little bit and kept my l85 VR's. I'm currently using them for a few weeks as I've got a bit of a swing timing issue right now. But thats me, not an equipment problem.
The BB l89 is so unforgiving, I've just about quit using mine. The R15 is OK, but doesn't have the stopping power of the BB. However you are not penalized as severely when you miss the ding.
Hope this helps a little bit.
phred952