After reading all the reviews it appeared this was a very good headset except for the oversized part that fits in your ear.  Since I am a big guy I figured this would not be a problem for me.  I was wrong.  It will not stay on your ear (keeps falling off when I bend over or chew) and it will not fit in my ear properly either.  On top of that I had many complaints from callers on the other end about call clarity and having a hard time hearing me.  I have tried many bluetooth headsets and have finally found one that fits good, easy to wear, and I have had no complaints from callers.  In fact when I asked some people they said I didn't sound like I was in a well and echoing like in the past.  The headset I ended up with is the Plantronics Windsmart Voyager 510 ($40 at Amazon).  I hope this is helpful to some of you.