This unit is a bit awkward to put on, but the sound quality and volume are good. Since it is a wired device, the volume and mute are controlled in a small box about one foot below the ear piece. Unfortunately, that tends to get caught on the edge of a desk when you are working and talking. The mute control is excellent and invaluable. If Plantronics moves the control box down another 6 inches, this goes to 4 1/2 stars, but the awkwardness of putting it on prevents it from getting 5 stars. However, once in place, it stays there and is comfortable to wear for long periods of time, except for that occasional jerk when the control box catches on the edge of a desk.