Instruct: Classify Amazon reviews into positive or negative sentiment
Query: I've had it for less than a month and it's broken

I bought this bike with the hope of using it as an easy way to get some exercise into my hectic schedule. However today, after using it on the second setting everyday for the past 15 days, it started making a strange grinding noise. At this point I can no longer push the peddles. I did not expect this kind of performance based on the other reviews. Up until today it was a great bike and I am very disappointed that I can't use it anymore.