I've been using an Apple Magic Trackpad since the summer and I don't think I'll ever go back to a mouse. Besides two finger scroll and two finger plus thumb click for RMB, I don't use any multi-touch gestures with it.

Every MS mouse I've ever owned (4 I believe) other than the very first (huge and wired) Intellimouse Explorer has disintegrated within 2 years, some with barely any actual use. The rubber and glue start to change color and fall apart even with the mouse sitting on a shelf (away from sunlight). I won't buy another MS mouse again.