You made a great purchase!
I've had one for a few months, and love it.
I tried about 8 different BT headsets over the past year, and this was the winner. I went through the top end stuff from Plantronics, Motorola, and Nokia before I got this. It's the only one that the person I'm calling can actually hear me, and not what's going on around me.
The rated talk time of 6 hours is a bit ambitious, but I'd say I easily get around 4 to 4.5 out of it. I'm not sure the total standby time because I usually turn it off when I'm not using it. I'm not one of those people that wear it around all day long just for the sake of wearing it.
I've only got a couple of complaints about it, though it's more like a wishlist. It doesn't have a mute button on the headset. That would be a very welcomed feature. It doesn't handle call waiting. At least it doesn't seem to with my phone (Sanyo 8400).
Neither of those issues are enough to turn me off to it though, and it's the headset I recommend to people when asked.
One thing I will tell you though as a new Jawbone owner/user. Spend a good amount of time trying out the different eartips and earhooks. It took me a while to find one that fit comfortably, and put the headset in the right position. Most people can probably get away with default tip that's installed in the packaging. I use custom tips for my iems too, so maybe it's just an ear shape thing for me.
Enjoy your new toy.