Summary: I slightly regret not buying a mouse with extra buttons.
Pros: Everything works properly. As a casual FPS gamer who's never used a real gaming mouse, this has everything I could ask for in something so cheap.
Cons: The sliding pads on the bottom rub off and leave little black marks all over my desk. The marks wipe away easily with a little bit of elbow grease, but always come back with use. They don't impact performance or how the mouse slides, just annoying to clean every week. It probably only happens with the particular finish of my desk (cheap wood laminate).