They do look very nice. I like how the mini-plug part has the same shape as the earpieces. But $350 is a little high in my opinion for these and the UK price is just ludicrous. But then again, they are the world's smallest earphones so that may be important for some. I'd like to hear them.
There is a very positive review from someone that has all the high-end IEMs here:
Amazon.com: Klipsch IMAGE Noise Isolating Earphone: Electronics