Summary: I have used a variety of headsets from different manufacturers, and in the past have experienced problems with comfort, sound quality, volume and security. Plantronics have completely nailed all of these problems with the ML18 by combining some very advanced electronics with a clever design that securely and comfortably locates the earpiece in exactly the right place. Clarity and volume are excellent, and pairing and call handling are easy and intuitive.
Summary: This headset is great. It fits very comfortably over the ear and because the loop is fixed it stays in place. I forget I'm wearing it. A voice tells you that you have it switched on/off and when on how high the battery is and when you are connected. Definitely the best one I've bought so far. Would highly recommend.