At first I was a bit skeptical that such is to have "gaming" mouse for this low price.
The mouse is very comfortable to hold, because it is larger than most new Mini Mice that are absolutely unmanageable for playing. One can with a simple push of a button from 3 different basic speeds and select works for me with Windows 7 without any problems. All the buttons are easy to reach.
Initially, the mouse has something strongly smelled of rubber, which is, however, completely disappeared after 2 weeks.
For this price there is for me no better mouse!