I was shocked by how much I liked the audio quality. There's a sweet spot in the unit's own amplifcation when connected by bluetooth. Above that spot, which is about halfway up, the audio degrades quickly. The bass gets boomy, the mids get gravelly, the highs get lost. Graduating down from the sweet spot, the clarity gets better but of course your volume will be capped off. If you connect the 3.5 stereo jack (included) you will bypass this internal equalization -- which resulted in a balance that I greatly preferred and a stronger musical performance through all comfortable decibel levels. They were even better after letting them break-in for a while. UNFORTUNATELY...wow, wow, wow do these things HURT my ears. There is an incredible, ridiculous amount of pinch exerting itself across an almost comical lack of padding. This sinister cocktail of too much and too little conjures up an unmitigable bear clasp that forces my ears to make contact with the speaker grills after a very brief period (minutes) of foam compression (note: I have very small ears and a medium-small hat size). Before long the pain is throbbing, it is radiating from every external part of my ear other than the lobe, and the unit has created an ache that will last for dozens of hours beyond the listening session. So...30 minutes with these cans can be nearly sublime, maybe longer for you. For me, though, the hulk smash effect has proven to be cumulative. I can't even put them on now. They bring me instant agony. Embarrassingly, I also bought them as a gift for a friend. Going to return mine. Perhaps these are a nice idea for a child or someone with zero ear compression sensitivity. At regular price, the build quality is lacking. The acoustic "mechanical pong" of the cheap menu buttons, in my opinion, are at borderline unsafe levels. Maybe it's a one-off with mine, but if not, I hope that will be addressed by the manufacturer. Overall, I truly say too bad...what a shame. Nice sound that didn't fatigue my eardrums paired, diabolically, to a medieval torture device.