Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Disappointed.

I originally bought these at a local Wal-Mart to take on a trip to Jamaica...well after the trip I decided to return them. Why?The noise cancelling didn't work up to expectations. I've tried other noise cancelling systems that worked as well or better than these, for a lesser price (price was around $60 when I first tried them). Someone mentioned a "hissing"...I noticed the same thing. After a minute your ears will adjust to it, but if you're sensitive, it can give you a headache.The bass response was also a lot weaker than I had hoped for.Bottom line: If you want sound quality, look somewhere else.