Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Great headset until it breaks

I purchased 3 CS50 headsets for my business and was elated with them for about two weeks. Then the retaining rings that attach the head band and/or ear hook to the headset began breaking. Within the first month all 3 headsets were out of commission because of broken rings. Plantronics replaced the ring attachments with new ones which lasted all of another 2 weeks. None of them were abused in any way. Now, Plantronics claims to have replaced the brittle plastic rings with nylon ones that are supposed to be more sturdy. So far, they've only sent me ONE replacement set for my THREE headsets. It's only been a few days so I don't know if they will be any better. My other two headsets sit unused.