DO NOT BUY :(
Sad to say, this mouse is substandard junk. Right out of the box, it was malfunctioning - The scroll wheel would work fine when scrolling up/forward, but when scrolling down/back it would kind of spaz out, and it'd be random whether each "click" of the wheel would go up, down, or not do anything. It went down most of the time (70% or so) but the failure rate was still unacceptably high so as to make it a constant frustration to zoom out of anything, such as webpages, or to scroll down pages.
After a month of normal usage, the mouse broke farther. The left mouse button started to deteriorate. It's been a week since i first noticed a problem with LMB. Now when i click LMB, it often doesn't register unless i press quite hard. And when it DOES register, it can't register me clicking and holding very well - When i click and hold, the mouse seems to randomly think i'm rapidly clicking, and will often trigger 2-3 clicks when i press the button only once. This can be disastrous when playing games, managing files, etc as windows triggers many things with a double click.