They sound great to my ears, though sound quality is very subjective (and I'm not exactly an audiophile). I mostly find them comfortable, although they are a little small; the range of adjustment in the headband is a little less than I would like. If you have a narrower head, this likely won't be an issue for you - and the tight fit certainly makes them feel secure on the head. The overall build feels a little light and cheap (although they've held together fine so far) but perhaps not worse than you might expect for the price. Battery life is good too - and it's possible, though a little awkward, to charge them in the case, by threading the cable through the top of the flap.
The only real issue I have so far is the touch controls - these don't seem to work at all unless they're switched on and off in the app every time the headphones are turned on, and even then the double tap to switch between ANC and transparency has only worked one time, for no apparent reason. For me, this doesn't matter too much, because I'm listening at home and I can pause and play and adjust volume using physical buttons on my phone without taking it out of my pocket (and I almost never skip tracks), but it might be very inconvenient for you.
