I am on my third one and love the call quality.  I really love the swing out mic that turns the earpiece on and off.  You can save a lot of battery life by having it off until you get a call.  Swing out the mic and answer the call by the third ring. But, and this is a huge BUT, the swing out mic is also the weak point.  The wires in the arm eventually weaken or break.  At first it will sound like you are far off and then it might not work at all.  As such, I cannot recommend this earpiece to others.