Ok, my take on the ASG-1 after about 20 hrs burn time:
When I'm not listening intently, the ASG-1 seems to do just about everything right. It's the most neutral headphone I have owned to date. Its very good at revealing detail, probably more than any IEM I've owned. But when I pay closer attention to the tonal balance and try to really immerse myself in the music, the lash of lushness is disappointing and the spike in the upper mids makes me cringe. Vocals are surprisingly clear at lower volumes, but not enveloping or forward. I disagree with the sentiment that they sound "hollow;" they seem rather full and complete to me, just not particularly engaging or forward. Bass is great and EQs well, although doing so offsets the overall neutral/mid-focused tonal balance of the IEM. Cymbals, again, sound fine when I'm not paying too much attention, or when I tune treble up a bit, but as-is the cymbals are very dull sounding and seem colored by the upper mids rather than the higher treble.