The headphones themselves sound pretty good. But when playing over bluetooth sometimes compression artefacts are audible. The artefacts are caused by the bluetooth protocol for stereo audio itself, so you're going to hear them even if you play FLAC files.
Also latency is pretty horrible. 200 ms+, enough to be obvious.
I think those are what I have at work. I'm quite sure they do a bunch of stuff of DSP/EQing to make them sound better than they are. When you turn the power off and use them as normal headphones they're mediocre at best.
