It seems like automotive "journalist" (and I use that term loosely) always praise R&P steering for its quickness, or being more responsive, and for its light and agile "feel". Since these are all subjective opinions (shared by many) then there must me some truth to them. But as Cincy Slim pointed out, in the real world, and not on a race track, there is alot to be said for the RB's heft.
Personally I feel the only real test for how well a certain steering system works is to take it to a slalom course. Of course weight distribution, suspension, chassis stiffness, tire performance and size all come into play on a slalom course. But I can think of no better (or less opinionated) way to put a cars steering system to the test.
When a Limited Crossfire can go thru a slalom faster than such cars as a NSX, every BMW, Ford GT, Lambo Gallardo, Miata, RX-8, Mini Cooper S, 350Z, Boxter, and match a SLR McLaren, I'd have to say the old "antiquated" system is still holding its own quite well.
R&P may feel better, but RB still gets the job done.

(results taken from Oct. '05 Road & Track magazine "Road Test Summary)