Summary: For $40, I'd expect a mouse that can left click without issues. I guess I was wrong. RMA'd.
Pros: Lightweight mouse without 50,000 buttons.
Cons: Quality issues --- the left mouse button doesn't always register. If you hold it down gently, it will click/unclick on its own. A mouse that can't click reliably is as good as garbage. Both left and right buttons have a very cheap/light plastic-y feeling during the actuation, as if the mouse has already been used for 3 years.