I purchased my MM from the Apple store in Ginza, and from the start I was not impressed. First is the tracking - it's really bad, even patched with one of those free extensions. It's not fast and performs poorly on virtually all surfaces I've tried it on, including mouse pads designed for optical mice. Then there are the runners, which are not low friction and make mousing like dragging fingernails across a chalkboard - even on smooth desktops. Then there's the crashing - makes the bluetooth pref pane go spinning ball, even w/o the keyboard in use.

The touch action is just not happening as well as a scroll wheel. Swiping is another mess. I'm glad it's not Summer, or sweaty hands would make it worse.

Pro-MM reviewers are correct - it's the best mouse that Apple has made. But that's not saying much.