Ok.
Just got these.
$400 shipped, used, only stipulation is that the stock cable is shorted. An aftermarket one has been provided as a substitute.
Bass immediately sounds offensive. Rolls off too early. Flabby and thick. Wait, why do these sound dark? Aren't these supposed to be bright? Turn them up a little. Holy ****, nothing could have prepared me for that treble. These sound super metallic. Gross, wow. Everything sounds wrong. Midrange is recessed. Upper midrange is almost absent. Treble is violent and sporadic. Ow.
Resolution is good, clarity is not due to recessed upper midrange. Soundstage is above average. Comfort is absolutely fantastic; almost better than HD800. Build is good. Frequency response appears to be the only massive issue with this headphone.
Bizarrely, these are the most tolerable with electronic music. I was expecting otherwise as most electronica is mixed poorly (brightly). The moment anything recorded comes into play, I want to gingerly rip them off of my skull.
More to come as I get used to them.