I bought the Logitech MX900 bluetooth mouse on sale, and it works very well for a wireless mouse. I have the newest drivers and software from the Logitech's Website, and I have options to configure all the options that I want.
However, the thumb buttons (forward/backward) does not work with Mozilla Firefox 1.0PR or Mozilla 1.7. They do work with IE. This is the most important feature I look for in a mouse, and I only use Firefox.