i can't use the mx100 on my good mousepad because it started the jittering thing, and i can't use a mouse like that...it sucks.
i asked on the logitech forums, and the one guy that replied said that he has gone through a few mx1000s and that it's a known issue. personally i think that really really really sucks. i loved the mouse until the jitter problems. ugh...so frustrated.
i would buy an icemat or something like that if they weren't so expensive. i don't have that kind of money to shell out, but at the same time, using my desk with the mx1000 is annoying as hell. so yeah, back to the mx500 until i can fix this.