Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Disappointing product from Sony

Disappointing product from Sony. I returned them already after a day. The main positives are that they are comfortable, and sound is quality is good when not moving. However, when walking with NC on, headphones produce loud thumps (perhaps by NC trying to correct for walking thump?). I also experienced the odd vibrating in one ear that others mentioned. Comparing to my friend's audio technica headphones which are only $50 dollars more on top of the $120 for the Sony, the NC was far better.