I just purchased the Jawbone this week.  I did quite a bit of research before buying.  I tend to be pretty skeptical of Bluetooth headsets.  I currently own about 6 of them.  Two different models of Plantronics, 2 models of Jabra, and 2 models of Motorola.  This particular headset was of interest to me because I have a loud car (corvette)  and none of my other headsets do an adequate job of cutting out the road and engine noise.