Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: One of Koss' weakest products

I got a pair of these as a replacement for discontinued Koss GT5s I sent in for lifetime warranty service. As nearly everyone has pointed out, they're very cheaply built, and the fragile plastic hinges on mine broke within a few months, rendering them useless. And the sound was pretty poor to begin with -- muffled highs, harsh mids, thin bass -- to the point that they don't even justify the $9 shipping and handling it would cost me to get them replaced by Koss's warranty.If you're looking for cheap collapsible headphones and are loyal to the Koss line, the Koss UR40s are a couple dollars more, are incredibly lightweight and comfortable, and sound drastically better than these UR29s. They're also slightly more durable, and backed by the same impressive warranty. Check out my review of them if you like, and stop considering these UR29s. They're terrible.