Great mouse. It is very sensitive in movment. I have had a couple issues over time. sometimes when scrolling, I get a backlash and if I'm scrolling up and stop, it scrolls back down on it's own. then same thing happens when I scroll down sometimes. Also I've had some issues with it not able to detect movment on some surfaces, like my light wooden desk without a mousepad. I will admit I'm not the most technical usere and haven't really set up all the buttons for gaming or anything, but these are the issues I've seen with it.
I will say despite all that, overall I'm extremely happy with this mouse. I've had it for about 3 years and really like it.