The sound is decent, if a little middle-heavy. If you are used headphones, which clearly separate the bass from the heights, the sound is a bit boring here at the beginning. But for the office at the desk always sufficient.
The build quality is solid and can so far see any weaknesses. The coiled cable has been effective.
But what needs to be said very clearly: The headset is not suitable for large heads. In which case of course the question is permissible, what is "great" precisely. I hat size 59 or 60 and for me it was already almost the size setting of the listener. The cable from the bracket for shellfish are so short that you almost afraid to use the full Big ever.
In addition, the handset remarkably suppressed. This has also been mentioned elsewhere. And in fact it is used to. Headache I have so far got no them. I carry the handset daily three fourth hours with interruptions. But I could imagine that the then but is too strong one of the other.
The noise reduction can be described as pleasant. That is probably a matter of taste but, as you would like because has.
All in all, I can say for me, I would buy the headphones back in any case. Price / performance is optimal. But I recommend everyone if possible to try on the part times.