I'm using a Microsoft Arc Touch mouse by sometimes. It's more of a laptop mouse, but it come in times of need (when the left button of Logitech MX started acting funny) and as a gift.
I actually like it. The sensor bar instead of the scroll wheel especially: it's just amazing how it feels like a real wheel (the noise, the click feedback to the finger, etc.), with none of the cons. IMHO there's no turning back to a physical scroller after this.
Like of the 2 AAA batteries is good; about 1/2 week, using it a lot (but I'm not a gamer).
The thing that I hate a bit is the glossy surface of the front part of the mouse, buttons included, that obviously tend to attract grease & dirt very quickly.
