Okay, well I purchased these willing to take the punt as I was sick of getting tangled in wires or whipping out my iPod across the gym floor. Well, to be honest initially I was disappointed by the bugger as I just couldn't get them to sit comfortably whilst moving around. But! It then struck me that the wiring at the back is in fact moldable. This was a revelation of epic proportions. It took the player from being a nuisance to a pleasure to wear. I was able to twist and shape the wire at the back to give a more snug fit. An easier approach from a design point of view in my opinion would have been if the wire could simply be pulled through by the ear pieces to allow the wire to sit more snuggly on the head. The sound is surprisingly good I was expecting much worse, and it only improved as the headphones worn in. In all, I think if you have a reasonable amount of patience to tweak and play with the wire and test different bud sizes in each ear, you will come away satisfied.
The concept is brilliant but hopefully in the next iteration they make the player quite a bit lighter, allow for a more snug fit around the neck and head, also a greater variety of buds is required for a product like this to find the best possible fit.