When someone tries to sell you a mouse that is "optimized for Windows 8," they're selling a mouse that has touchscreen controls mapped onto it
Well-tuned touch zone doesn't do too much, but what it does, it does well; Comfortable to use most of the time; Lightweight and easy to pack.
Not too comfortable to use for extended periods; If you're looking for a mouse with a full suite of Windows 8 touch controls, this isn't it – no multi-touch functionality.