Held on in my hands today, decided against purchasing.
Apparently I use my mouse "claw" style, meaning that I basically grip the sides with my thumb, pinkie, and finger next to pinkie. I use the other two for clicking and such. This is opposed to the other style, where you physically rest your hand on the mouse, which I do not do. Evidently, the magic mouse is built for the latter, as it is too heavy to pick up, and too awkward to use normally for me.
So take a look at your right hand. If your second knuckle isn't touching your mouse, I doubt you'd enjoy the magic mouse.