I got these a while back off of woot for 150. They were technically refurbs,the box and everything was new and unopened, but I suppose that could be how factory refurbs repackage. Anyway, as for the sound I found that they are decent. By no means top quality but at this price not a bad deal.
They crackle quite a bit when going up to high volumes which bothers me, but at average volumes they sound good. I probably shouldn't be listening to music that load anyway, but sometimes I just gotta jam out. The noise cancelling is more like a sound booster. No real cancelling going on but the sound gets better, unless theres no music input in which case you get that static hum. I have a average hat size, and these were initially way too tight and especially bothersome with glasses on. I put them around a couch cushion for a few days and they fit much better now.
My biggest complaint is the actual cup size. I'm referring to the depth of it, my ears touches the grill infront of the speaker and after an hour or so becomes unbearable to wear. I have average size ears that don't stick out much so I would imagine others would have the same issue.