Pros: Fantastic sound quality: unparalleled clarity, volume and adroit noise cancelation for both the wearer, and the person on the other end of the call. Also, light weight, comfortable to wear and the build quality seems robust.
Cons: Trying to add too much technology to an intermediary device. Moving controls from the MFB to the volume controls makes the interface counterintuitive. Also, for iPhone owners who use Siri extensively, this creates too many extra steps and commands.