I have three mice that I am currently carrying with me. As well as two laptops. (one work lappy)
1) Microsoft Arc. This is not a gaming mouse. I do not recommend it. Feels too light, and no real way to grip it. Does not feel too good to play with.
2) Logitech MX Revolution. This is the old model that was discontinued. There was a problem with it in which I cannot use the side buttons to talk in TF2. All people would hear was static and feedback for some reason. This mouse feels really good and I wish that it didn't have that issue. The Dongle was also very long and I was afraid that sometimes I would accidently snap it off.
3) Microsoft Sidewinder X8. This mouse is very similar to my wired original MS Sidewinder at home. I do like how the feel of this is, even though it seems a bit big, but I think I'm just use to the sidewinder design and feel of it. Reminds me of home. I think I'm going to leave this cordless model at home and bring the old version out. It's quiet troublesome to actually bring the wireless receiver since it's big. Big because it contains the wire that is rolled up in there as well as additional mouse feet inside. (Teflon coated?) My only wish was that the receiver was smaller or travel size just like the Arc. *sigh* I'm still out hunting for the perfect mouse for my Alienware m15x.