this mouse would have been good if it were doing what it is supposed to do. all the features, programmable buttons, the diods shining everywhere, single button to switch sensitivity.. cool. but the mouse itself moves terribly. it keeps "shuttering". when you move it to the left, it still keeps shaking and makes vertical "jumps" sometimes. and no, it's not my hand shaking along as i move the mouse. plus. sometimes it just stops reacting! it hangs and won't move. then you have to click one of the side buttons to put it back to movement. and it gets REALLY annoying when you're doing some work (or play games) and not just browsing ...  Read the complete review