Instruct: Classify a review into positive or negative sentiment.
Query: Lasted less than a month

I purchased these at Costco for $40 3 weeks ago for my son. I thought "ooh, kevlar reinforced, this is perfect!" Three weeks later, the left earphone stopped working. They are still under warranty and I just sent them back for replacement, but based on what I'm reading here, I have low expectations for the next set. I would have given them just 1 star but my son said he really liked the sound quality (lots of bass just like a 14 yr old would like).