The earpiece allows for great sound quality and is quite comfortable. The microphone also works well, but (according to people I have called) it applifies everything. If there is even a slight breeze, the microphone picks it up. The one thing that I was unhappy about: it significantly reduces reception. I tried using it in several areas, and in every case, the reception indicator was a line or two (or three!) below what it was without the handset plugged in.