I'm lookin at buying a wireless Mighty Mouse, but some of the reviews on Apple.com are making me think twice about buying one. Has anybody ever had problems with the wireless MM? What about the scroll ball? Any problems with that? Is the tracking very good? Do the right clicks register correctly all the time (when you right click, does it right click and not left click)? Oh, and is cleaning the mouse a must? Thanks. I hope the responses are good because I really want one.