The headset has good sound quality but it has a very poor mute button design: 1) The mute button makes a clicking noise when turned on or off. This noise is audible on conference calls when I mute or unmute myself. This makes it pretty useless for me. 2) It is hard to distinguish between the mute on/off positions. The graphic is too small to be easily readable. They should have skipped the fancy blue led light on the USB connector and put a led light on the mute button like practically every other headset.
In short, for my needs the poor mute button makes this £40 wasted. I'm going to have to get another headset.