The audio quality is superb, the volume control and Mute button in the cables are fine.
The described Reviews, ddas was headset too low:
At the 2.5 mm jack is a small button with which the speech volume can be adjusted in 3 steps.
This was set to medium, which quietly arrived in fact the opposite.
Placing them on the highest volume (large dot), everything is fine of course.
Have Fun
Matthias