I went to grip shift after the jerky Shimano rep pissed me off with attitude, and they're great! Some SRAM is shimano compatible, and some is SRAM on SRAM only so I think you just nead to order the right ones. I had a chronic inflammation problem where the muscles in top of my fore arm were achy as hell where they attach at the elbow from the Rapid fire shifters- the day I went to Grip Shift the problem disappeared. The shifting action feels a little like friction shifters on the front derailleur and that takes a weak or so to get used to, but I love'em. I have small arthritic hands and had to take an exacto knife to the actual twisty part, shave a bit of rubber back, but overall I'd say the whole drivetrain is sweet.
Shimano's compatability hell no replacement part marketing policies really ticked me off, so I went to SRAM on principle when I needed a new drivetrain. To my delight, they seem more interested in fun on a bike than jerking the customer around. Cool, huh? Their chain design is truly superior, with a Master Link that pops open instead of buying a two dollar replacement pin every time you break the chain like the last Shi chain I had.
I'm pleased.

missliz