The Sidewinder X8 is the best wireless mouse I ever used. Fast, precise and no drops.
I been thru all the Logi G series mice (wore out many) including the G9 which I hated the most of the G series mouses. I like the G5 with weights the best of all the G mouses.The G9 interchangable sides/covers are so thin that if you grip the mouse too hard the side buttons can be activated...not cool in a game. The original Sidewinder I pref over the G9. But the new X8 Sidewinder is a joy to use, better feel and tracks a lot better. Too bad the workmanship is not as good as the original. I always been a wire mouse user for gaming. The X8 I think just converted me to wireless. I just like how it feel and reacts.
My current nest of gaming mouses
Top L to R
Logi G9, Saitek Cyborg with adjustable length (useless and too flat for me), Zalman FPSGun (POS)
Bottom L to R
MS Sidewinder original (nice but have to get use to the hump), X8 Sidewinder
a lot of mouses, couple of worn out G5, some Razor mouses (they are just too flat for me) and a lot of old MS mouses wired and wireless and even some ball mouses.
one of the most usefull old mouse that I use a lot when building or upgrading systems is a PS2 MS ball mouse...works everytime when USB don't all the time. Same for the PS2 KB's I keep around.
Also a lot of MX Revolution Logi mouses with the HTPC systems.
BTW if you were wondering about the widths. L-R Sidewinder, G9 and G5
ADD: Note the worned out G5 paint at the back...the feet are totally gone like the other one...RATPADZ GS mouse pad surface just ate them up.