Originally posted by mc68k
I'm using the same mouse with OS X. Switched from a corded optical m$ mouse and haven't had any regrets. I could never go back to corded for personal use after this. IMO, this is the best mouse out there. Says on the box that it has no support in X, but the default X drivers pick it up right after you plug it in. I use USB Overdrive X to program it's various settings/buttons.
Transmitter for the mouse is smaller than the mouse itself, say, about the size of a baseball distorted in a weird shape. I haven't noticed any RF intertference even with all the electronics in my room. Range is about 6 feet, but you wouldn't ever need to get farther away than that.
Batteries are no problem, even with heavy use. The sensor blinks a lot trying to conserve energy whenever it can. It's only constantly lit when it's in motion. Otherwise, it just sends out a pulse every now and then when it's inactive.
The rubber grip on one side is nice. This mouse is made for the right hand though. The ambidextorous mouse is a step down from this one IMO.
It's ugly but as they say, form follows function.