I've spent the last two weeks ordering and returning bluetooth headsets.  Finally, after going through quite a few models (Motorola H350, Motorola H500, the Plantronics 655, the NX6000), I found a GREAT one.  I was willing to pay up to $150 for a headset that was comfortable, easy to use, and -- most importantly -- that my callers didn't complain about.  This headset has great sound quality on both ends, and the setup and buttons are very easy to use.  The boom folds out, and the headset turns on.  You fold it back, and the headset turns off.  Several of the headsets I tried had TERRIBLE buttons -- small and hard to work without looking in a mirror.  These are great.