I've goon through more mice then I can remember.
Right now I'm using this,
Kensington Iridio and really like the way it tracks and feels.
If they made that in a wireless model that used Bluetooth and throw away batteries I would buy it, but the only wireless model they make is this HUGE mouse with a HUGE charger that needs another piece plugged into the USB port since it doesn't use Bluetooth. (my laptop has Bluetooth built-in)
Since I'm a laptop user I don't want to also have to lug around a mouse charger and mouse receiver.
When I was at CompUSA the other day I did see some mice that where small and did use Bluetooth over in their PC laptop section, but they wouldn't let me try them before buying them and since they were no name I had no idea what kind of driver they would have.
Both the mouse button and scroll wheel will work with no mouse driver, but mouse makers like Kensington or Logictech make good drivers that allow assigning functions to the buttons and custom tracking settings so for me the driver is very important as I do a lot of graphics using a mouse.
Apple sells a nice form factor Bluetooth mouse, but I hate mice with only one button.