Initial impressions: wearing a neckband is a lot less intuitive than the standard headphones or even earbuds, but you quickly get used to it. Pairing was simple and effective and the idea of having a pause button on the earpad is great: saves having to fish out the phone, swipe the screen and hit pause on the player every time I need to pause playback. There's also a volume button on the pad, again a great idea and saves so much hassle.
Have not been out with the phones as yet, but indoors they seem quite clear and relatively comfortable. Might feel like a bit of a knob walking around with a blue flashing light on my headphones, but no more I guess than anyone with a bluetooth headset. Very compact and seem quite durable. Impressed so far anyway. Will test them in "field conditions" tomorrow when I head out.