Our desk - and car - is littered with the skeletons of Bluetooth headsets. Some we didn't like because of the sounds, other's for the complicated controls, others for the fit.
The only one we're using constantly is the Jabra Stone but with the new - IMPROVED! - Jabra Extreme , we're upgrading. This incarnation utilizes Jabra's noise cancellation technology, "Noise Blackout" with dual microphones. We know, we know, everything comes with noise cancellation these days but The Extreme also has an automatic volume control which automatically adjusts to the environment and your conversation (ie if you're whispering to your BBF about your BF.)
We also like the voice quality for the end-user; while it eliminates ambient noise it retains natural sounding voice on both ends of the line. Less robot; more human.