Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Really the best mountain bike grip on earth.

Durable. Comfortable. I think they look pretty cool. Cheap. The list goes on...I've been using these for years and keep coming back to them. The only downside is they are extremely difficult to take on and put off. Some people recommend hairspray or some similar aerosol spray to lubricate them to get them on but I've found that just makes them slip, even after drying. The best way to put them on is to use an air compressor, but if you don't have one just use brute strength. It'll work...eventually.