Having the Jabra evolve 20 (2+ years) as a reference point, I was very disappointed with this particular headset. Average build quality, small headphone diameter (~4 cm), relatively uncomfortable fit (gets better after a while). Very low sound quality, almost any mobile hands-free you use will sound much better. The "controller" that is integrated on the cable is located ~35 cm from the headphone, which means that if you are standing or away from a desk, it hangs in the air. Also, the 4 buttons on the controller (vol up/down, mic/speaker mute) do not work for me. Finally, the controller has a blue LED that flashes ALL THE TIME, even if nothing is being heard. In the end, I regret the 21 euros I paid. I would have been better off spending the same amount and getting the tried and tested Jabra.