The first issue we raise with the Magic Mouse is its size and shape. While there's no way anyone can dispute its simple hotness, we struggled through a difficult learning curve due to its uniformly narrow profile that sits too low for comfort. It might be because we're so used to the Logitech MX 1100 cradling each of our fingers with a designated resting point, while the Apple Magic Mouse just feels like a chunk of finely carved polycarbonate.
My first thought looking at an image of this was that it would feel crappy, and apparently I was right. Bet they'll still sell millions of 'em. ;-)