Had listen to this headphone for last two days.
I would say personally I like this sound sig so much, It's slight bright but not as much as HE560. Kind remind me of LCD-X sound with slight bright presentation, more forward mid, accurate sound but at the same time there's very musical and intimate feeling that made vocal songs so addictive. Bass is not as big as Audeze, not very punchy, but they have tendency to full body and smooth bass presentation.
I love the soundstage presentation, very good depth and width, wider than my Oppo PM-1 indeed, and more airy feeling too. I prefer Ether's imaging than LCD-X that I had before. It's just feel more "complete" and accurate.
Love it for jazz, acoustic, even some Top 40 songs. Poor recording would gonna become crap though.
Tested them via few set up, but what I like the most for now is Sony D-100 and Bakoon HDA 5520.
It's not really hard to drive them, but they reveal the quality of set up very well.
Would post few photos later.