Instruct: Classify Amazon reviews into positive or negative sentiment
Query: 100% Bad Quality

Good sound quality but poor design/manufacturing quality. Like many others, I've had these expensive headphones for about 2 years. The plastic is cracking on both sides of the phones. I glued one side with JB Weld and have a twist tie on the other. Fairly soon I will not be able to use them at all. I've looked for repair parts but there are none and Bose will not repair them. Stay away from these if you value your $$$$$.