Like the mighty mouse before, this mouse too is unusable for Unreal Tournament 2004 (and probably other games, but for me, only UT matters these days) as it does not allow the user to press both mouse buttons at once.

Keep that in mind.

Also: Why wireless only? I never felt hindered by the wire and I certainly don't see a reason to waste even more batteries.

Also, I feel much more accurate and comfortable using a trackball, but this certainly is a very personal point.