Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Certainly not "Premium" - more like "Garbage"

There's foam on the underside, not rubber, allowing the pad to slide too easily. The tracking surface of the pad is too slippery and smooth for mechanical (ball) mice and not patterned enough for some optical mice. If the mechanical mouse's tracking ball gets even slightly dirty/dusty, it won't track properly.