I use this headset when I am driving and need to make cell phone calls. I was surprised at how clear sounding my calls were and people I have called have told me that they could not tell that I was using a headset, it sounded just like the phone itself.The only problem with this is that it has a tendency to slip. I hangs off your ear and can rotate down so that it feels like the mic is moving away from you ear. I am not sure if it moves far enough to effect sound quality, but it can be annoying.