I use one almost exclusively. Of course I drive and talk on the phone. A Lot!
The life of a Salesman.

I have gotten so use to it over the years that I use almost exclusively to talk on the phone. In the office, the yard, etc. Almost feels weird now to hold the phone up to my ear.
I use the Jabra JX10II. It is small, light , and lots of cool accessories for charging. It is starting to show it's age though and the "noise reduction" is not that great. Sound quality is excellent though. I will probably upgrade to the Jawbone 2 soon.
I use a wired headset to listen to music. May have to look into the BT ones.
Slightly [OT] I totally agree with the law that requires using a Headset
(wired or BT) while driving. As someone who does this for a living, a headset is a
MUST. If you drive and text/email while driving, you're an idiot! What I do
NOT agree with is the notion of banning ALL use of cell Phones while driving. This is just an example of the PC police taking a good idea and screwing it up!

Sorry. Back off soap box. Continue the discussion.