Instruct: Classify Amazon reviews into positive or negative sentiment
Query: P.O.S.

This bicycle is inexpensive, but it rides like it. It also looks cool, but that's it. The gear-shifting system is horrible and outdated. It makes a grinding, metal-on-metal sound while riding in the lower gears. Does it look cool? Yes. Does it need major work after market purchase? Yes. I should have paid the extra $100 to get a different bike, because now I'm stuck with a $159 P.O.S. I was trying to save money, and at the same time look good, but it only half worked.