I took a shower once and ruined it because I was scrubbing it all over myself under the tap.
Actually, it's not bad, but it lacks the ability that better "mice" have. I stopped using mice back in the late 90s and found 5-button thumb balls the be completely superior for gaming, video production, online surfing, art, etc.
If you haven't found the worth of something with 5 buttons, then the Magic Mouse is fantastic. It is the best and most-responsive mouse I ever used. The ones I have are merely closet stuffers until my favored devices break.