Ok, 4 months in, and I've decided that this "Mighty Mouse" sucks. The trackball on top has ceased to track. I've cleaned it a dozen times and that works for a few hours, but then it just stops responding accurately. I've stuck my old Logitech mouse in for now so I can scroll again, but is there a good reliable Mac friendly mouse out there? I like some of the features of the MM, but that track button really blows.