Just received my shiny new U6 today. Listening to them right now and I must say I am very impressed! Playing them through an AK Jr and soundstage out of the world - really the best I have heard so far from an IEM. I was worried about not having enough bass but the bass coming out of these is really good. Most impressive however is how the whole frequency range is present - everything just gets through crystal clear (to my ears at least)! These were certainly worth the long wait. My only complaint is that I am now wondering how much of an improvement the U12 would be!
I order the U6 myself but i did it through the phone and one of the customer service told me the U12 are flat,
so if you like bass the U12 are not for you, be happy with your order