Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
I'll withold final judgment until I try it, but this thing doesn't look all that functional to me. The ball looks tiny, and the side buttons awkwardly placed. I'm guessing this thing isn't going to pull me away from my wireless two-button w/ scroll mouse.

As for the Powerbooks, I hope Apple sticks with the one-button config. It looks better and is equally if not more functional.
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.