The sound is clear, since no analog conversion is performed. Therefore, the noise barrier is very far down. This helps to clear bass / treble difference. The earcups act well made and close. So also, reducing ambient noise.
A solid system, which (as you can read) a headset charger missing. But a charger does not cost much. And the headphones save good battery. Another plus is full Kompatibelität, since the transmitter has an audio In. It can also send audio via USB. So you can use the headphones under Linux.