I have been reading this site for the last hour on various bluetooth headsets for various BB's... and as you know the number of opinions are as many as the number of posts. The information has been good and worth my time reading. I've read a lot about sound quality, but it isn't clear where these people are spending most of their time on the phone (i.e., home, car, outside, inside, cube, etc.). I haven't seen much conversation around using the BB/bluetooth while in a car... which is where I use it 95% of the time (and no, I am not driving while talking... just a passenger.
I have used a handful of bluetooth headsets that work great when I am in my office. I have yet to find one that works good while in the car (noise cancellation). I recently dropped ~$150 for the new plantronics discovery 665 (which touts the AudioIQ and how it is so good at noise cancellation.). To tell you the truth, nobody could hear me on this thing while I was in my car. It was great anywhere else and I love the look and feel. I recently switched back to my $15 Motorola bluetooth which works better than the plantronics, however, it still has it's car deficiencies.
I've read a lot of positive about the jawbone, and at this point I am leaning towards purchasing one (while substituting a jabra earpiece for better fit), but don't want to drop another $100 on a headset that won't work in my car.
Thanks for listening (i.e. reading) to my banter.