I used the
Microsoft IntelliMouse Explorer for Bluetooth for about a month with my MacBook. It's a decent mouse, although I wasn't happy with its performance on OS X. For one, the IntelliMouse software download for this particular model doesn't list an OS X version--I used
IntelliPoint 6.22 for Mac. The software allowed configuration of the back/forward side buttons and the mysterious application switching button below the scrollwheel (worked well with Expose).
Unfortunately, I had sleep issues with the laptop when the mouse was active. Fairly frequently, the computer wouldn't wake from sleep if I didn't explicitly disconnect the mouse before closing the lid (or manually put it to sleep). Even more frightening, there were numerous occasions when the laptop wouldn't sleep when closing the lid. On a couple occasions, I closed the laptop without turning off bluetooth and put it in my laptop bag without confirming that it was asleep, only to find the battery completely drained and the laptop blisteringly hot a short while later. The sleep problems ceased immediately after switching to a bluetooth MightyMouse. I'm not a fan of the MightMouse's right-click, but it's better than melting my laptop. I'm not sure if it was a hardware or software issue with the IntelliMouse, but I would hesitate to recommend using one with a laptop. Of course, the sleep problems wouldn't be such an issue with a desktop system.
Although not as big of an issue as the sleep problems, I also noticed that the tracking of the IntelliMouse was much more jerky than that of standard USB mice or the MightyMouse. It didn't hamper the usability of the mouse--just a minor annoyance. It's possible that newer Microsoft mice operate at a higher resolution than this particular model.
Hope this helps.