Normally I don't do reviews, however, this HP mouse has gotten on my last nerve! For some reason, the optics make the pointer "jump" sometimes when the system is "thinking". A lot of times I'll be playing a game, then suddenly it "jumps" to the corner (always a corner) and when I click it closes out the window! It happens constantly and I try to make sure that I know where the cursor (arrow) is before I click, but it shouldn't be that way. I'm currently looking for a non-optical mouse as I write this.