Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Next to worthless

Not only did this set of headphones not deliver muich noise canceling, but one of the earphones quit working. The replacement headset fared no better. Check out a Brookstone product that used to be $150, but now is between $60 to $70. They may not isolate you as well as either of the super-effective (and super costly) Bose, but they come very close and do a credible job for a lot less money.