The futuristic look with blue light flashing behind a grating is very successful. The mouse provides a good grip, it's just the size of the hand and its ergonomic suits me fine: no fatigue use. Unlike other reviewers I have not been worried by mistake click on the next button, they barely exceed. To end on the positives, the mouse is rather silent, the click sounds are low.
Only slight downside, the mouse is very light, and the wire is quite stiff, sometimes hinder movement. But it's really minor. In a word Logitech performs flawless.
