Well, the mouse quality is decent and all that -- my one gripe there is the over-sized dongle. My biggest gripe, though (and I only WISH I could return the thing), is that scrolling doesn't work when the mouse is connected to a Mac. running ANY version of OS X using manufacturer's drivers or not. I would not have rated this mouse so low for that had it not been for the fact that the manufacturer claims it works with all version of OS X.So, if you're using a Mac., stay away from this mouse as it will be useless to you.