Mine just came in today...sorry for the less than stellar iPhone picture.
First impressions: They are as comfortable (maybe more) than the Jawbones, but have a smaller profile that makes them quite a bit more suitable for wear off the bike (at least for my application).
The lower jaw design is identical to the Jawbones, and swapping lenses is a breeze. I ended up with the matte black/black iridium and VR50 pair, and I'm glad I went this route. These are going to be VERY nice when accessory lenses are available. I'm going to play around tonight and swap out the matte black thru bolts with some silver ones from a pair of Jawbones.
And when these go to OCP.....oh yeah, baby. :)