Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not good for mechanical mice

Despite the claims of "For Use With Optical or Standard Mouse Pads", it's too slippery for my ball mouse to grip, which sort of misses the point of a mouse pad. It may work for optical mice, but those aren't supposed to need a pad.I'm still a little vague as to why I'd want to use a mouse pad with my mouse pad, but I'll chalk that up to the usual lack of proofreading in Amazon product descriptions.