Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Poor build quality - too bad.

I've owned a pair of QC2's for about a year now, and after about 6 months they started making an annoying squeaking noise if I wore them while walking. Then this morning, I went to put them on my head, and the headband cracked, making them pretty much useless.I've had $50 headphones built much more solidly than these.