been looking at this too which version of ss rival would be best the 62271 ?
That's the one I use and I love it! I have large palms, short fingers and this mouse provides amazing comfort, with the side buttons having perfect reach placement for my thumb. I also love the side grips that keep me from having to use a death grip for lift-off.
I recently picked up a G502 (hard to pass it up at $40) and ordered a G303 (should be here this week). I can't say I'm very impressed with the G502- as far as comfort and overall feel. The back mouse button is practically useless for me (can't bring my thumb that far back from my normal grip) and every once in a while it starts to jitter so bad my screen looks like I'm experiencing an earthquake (happened with my PR at both 1k and 500Hz, no acceleration, straight and curved ballistic curves). It will definitely be a back up to my Rival.
The G303 is a claw-grip mouse, but it also feels great in my hand and the side buttons are well placed. It has the same sensor as the G502, so I can't say I'm anxious to get it- but I only paid $25 for it.