I tried the MM and returned it after a few days due to not being able to hit more then one button at the same time.
Now I use the Microsoft Wireless Laser Mouse 8000 (full size, not the Presenter). With the latest Intellimouse 6.2 drivers it works very well, other then the cursor is a bit slow (not laggy, but takes large movements to move). This is easily corrected via a one-time "defaults write -g com.apple.mouse.scaling some_number" from a command line. Oddly when using the provided dongle the movement did not exhibit the decreased sensitivity.
Some people have reported difficulties connecting the mouse, but at least for me it was trouble free.
The back button could have been placed better, but the mouse is ambidextrous.
This is a bit pricey for the mouse, but it is bundled with a couple of the MS keyboard offerings. I use the Entertainment Desktop 7000 wich was just over $100 online. the kbd has a very nice feel to the keys, but is lacking a number pad and physical function keys. Also beware that the drivers are less functional for the keyboard, only providing the basic functionality.
If you use a PC and a MAC you could always use the mouse on your MAC and the keyboard on your PC with the dongle.
The style of both match the MBP nicely and the movement is smooth and responsive. I'm happy to be dongle free.