Got the ASG-2 in the other day, part of the same loaner tour as Purrin.
So far I'm really enjoying these. A much better earphone than the ASG-1 I had. The treble is there, but it has this silky and easy-going quality to it. I can listen to these for a while without feeling fatigued. Very polite.
My biggest complaint is the suck-out in spots, in particular the effect it has on some vocals. Makes them sound withdrawn. Actually I'm experiencing the same thing as on the LCD-X, what I call the "volume roller coaster" now: having to continually adjust the volume up and down depending on the track.
Build quality on these seems nice, and I'm finding them to be extremely comfortable.