I don't like the loop that goes behind your ear (I wear glasses) and this one look like it can be used without one. Also, the Plantronics 655 looks exactly the same so I'm guessing that this Blackberry headset is the same item as the Plantronics 655 with a different brand name on it.
Jawbone's nice and all (I personally haven't used one) but I can't see myself spending over $50 on a bluetooth headset. I know some people wear them all day but I only wear them while driving.