For me, the magic mouse is the best mouse I ever used. I am using BetterTouchTool to configure its touchpad part though. The mouse is very thin, so my hand comfortably rests on the desk and I can do all actions with my fingers. The big win though is, that I have perfect scrolling in y and x direction, something missing by all other mice I know of. I can use the whole back of the mouse for clicking. Especially nice is the ability to switch desktops or activate expose with multi-finger swipes.

I even mange to play StarCraft using the magic mouse.