I'm going to play devil's advocate and say that I hate the Apple mouse. To my, and many others' hands, they're ergonomically nightmarish. Hard to reach side buttons, hard to control little rubber nubby button (i.e., easy to accidentally press), and the shape just doesn't seem amenable to long-duration use. Our computer labs recently replaced the Apple mice with Microsoft ones en masse, and few people in my research lab use the stock ones that came with the iMacs. We went off to buy our own. I personally use a Logitech VX Revolution. It's not Bluetooth, but IMO it's a good sight better than the Apple BT mouse.
FLAME ON!