We should have some more impressions of this amp soon. Tonight I tried pairing my SRH1540, my Fidelio X1, and have been burning/ using the amp for roughly 24 hours. My full sized cans sounds outstanding using this amp. Vocal performance is absolutely stunning on this amp..Vocal dynamics have to be heard on this amp..It does everything well but vocals have that extra something, I think more rangy is a good way to describe it with absolutely no harshness to be heard.. It does seem to last the 12 hours according to the manufacturers spec.
I suppose if I was to complain about something I do wish the amp lasted longer but considering how much power this thing has on tap 12 hours is very reasonable..I do notice that bit of rawness of sound that I heard on open listen is starting to dissipate. I plan on having this amp play most of this week to fully work out the hardware..It already sounds very refined so any increase in sonics is going to be a bonus.