I've had a number of Jawbone headsets in the past, and love the idea of the "Noise Assassin"...  But in reality I was quite disappointed with this.

The USB doesn't work with Linux (Ubuntu 12.04, 12.10, and Fedora 18), it only shows up as a microphone, it can't be used to hear audio.  Unfortunate, because Bluetooth under Linux can sometimes be problematic, and the sound quality of bluetooth "headset" profile is dramatically worse than USB.  Of the USB headsets I've tried, this is the only one I've not been able to get to work -- usually USB headsets are super reliable.

When using it with my Android phone (Galaxy Nexus, Android 4.1.1), the audio has been spotty, either the caller can't hear me, despite my being careful to ensure the "nub" touches my cheek, or I have problems hearing them.

And the battery seems to always be dead, I charge it and then don't use it for maybe 3 or 4 days (with the switch set to "off") and I come back to use it and it's dead.  It "feels like" I always need to charge it.

In the end, whenever I've gone to use it I usually end up frustrated after a few minutes and switching either to the handset or to another bluetooth headset.  Literally, I accidentally left it at a coffee shop and got it back the next time I was there, but in retrospect I would have been just as happy to have lost it.

I also have a "over the head" headset of another brand, that does both USB and Bluetooth, and despite it being kind of huge, I find it fantastic to use.  I have to charge it far less frequently, it sounds way better when using with a computer because it is using USB rather than Bluetooth headphone profile, and works very reliably with my phone.  Plus, it covers both ears, so it is MUCH easier to hear in any sort of noisy environment.  The only down side is that it does not have Noise Assassin, so if I'm in a noisy location I have to mute it.  However, I've never found that Noise Assassin works as well as I wish it did.
I've had a number of Jawbone headsets in the past, and love the idea of the "Noise Assassin"... But in reality I was quite disappointed with this. The USB doesn't work with Linux (Ubuntu 12. 04, 12. 10, and Fedora 18), it only shows up as a microphone, it can't be used to hear audio. Unfortunate, because Bluetooth under Linux can sometimes be problematic, and the sound quality of bluetooth "headset" profile is dramatically worse than USB. Of the USB headsets I've tried, this is the only one I've not been able to get to work -- usually USB headsets are super reliable. When using it with my Android phone (Galaxy Nexus, Android 4. 1.1), the audio has been spotty, either the caller can't hear me, despite my being careful to ensure the "nub" touches my cheek, or I have problems hearing them. And the battery seems to always be dead, I charge it and then don't use it for maybe 3 or 4 days (with the switch set to "off") and I come back to use it and it's dead. It "feels like" I always need to charge it. In the end, whenever I've gone to use it I usually end up frustrated after a few minutes and switching either to the handset or to another bluetooth headset. Literally, I accidentally left it at a coffee shop and got it back the next time I was there, but in retrospect I would have been just as happy to have lost it. I also have a "over the head" headset of another brand, that does both USB and Bluetooth, and despite it being kind of huge, I find it fantastic to use. I have to charge it far less frequently, it sounds way better when using with a computer because it is using USB rather than Bluetooth headphone profile, and works very reliably with my phone. Plus, it covers both ears, so it is MUCH easier to hear in any sort of noisy environment. The only down side is that it does not have Noise Assassin, so if I'm in a noisy location I have to mute it. However, I've never found that Noise Assassin works as well as I wish it did.