I found this on lelong. You got better choices rather than the G1. Check out latest logitech release.
http://www.lelong.com.my/logitech-g1-gamin...3-06-Sale-P.htm

have been using G100 for awhile now, around 6 months+

when im at the medium sensitivity setting (didnt really use the lowest and highest setting), when i move slowly across the screen, it will shows some jerking symptoms, and the middle scrollwheel, sometimes it doesnt register when i click, and sometimes it double registers.... so getting kind of frustrated by it.... but the jerking symptom seems non-existent when i play games.... that is why im wondering whether the mouse is dying or just its attitude got problem..... >.<
also planning to get replacement soon, but wanted to ask whether these symptoms are common among G100 users....