Just received my HE-400 today after the storm(I live in NY area). Moon Audio next day aired it to me which is really nice.
I'm really surprised and amused by how simple the package is. There's not even manual in the box? The warranty card is also just one slip of chinese paper. Is that what it is like? Checked the driver, it's the corrected "2.5" version(white/gray color).
Nonetheless, paired with ODAC+O2, the sound quality so far is pretty awesome compared to my previous Denon AH-D2000. The bass is really tight and punchy. The sound is more open compared to Denon because of the open back design. However I find the it's a bit harsh on tremble(especially cymbal?). Maybe that's how it is?