FPS Freek by KontrolFreek | Accessories Xbox 360 & PS3 Controllers | Analog Sticks for Halo, CoD & FPS Games
Has anybody tried these things? At 10 dollars it's tempting to get a set to fool around with.
I have a set, and I think they're great. There was a noticeable boost in my accuracy. I prefer to only put one on the right stick, though, so $10 can outfit two controllers with stick extensions ().