Fulfills its function 19

Mouse acceptable, I must say that I do not extensively used because I found his grip quite rude and not very ergonomic, too light because it does not stand at the end of fingers. This mouse will fill the palm of the hand, as I like to have minimal contact with the mouse, while resting your wrist on the mat.
It is only a matter of taste, some enjoy this type of grip.

Technically, it works very well, and has the tilt option to assign two custom commands to the middle button, as you push it to the left or right (copy and paste in my case.).

Personally I found the absolute happiness with the Logitech LS1 Laser Mouse - Mouse - laser - wired - USB - coconut also available on this site, which is smaller, much more elegant, and is controlled using the end fingers. This will make troubleshooting mouse motion, and perform very well this feature!