Alright,
Back from the MTME headphone meet in Pittsburgh where @AlwaysForward brought his Mobius.
Regarding hiss: I could hear it, but in a meet environment is was heavily reduced and very background-y. But it did permeate music and very quiet scenes in movies, would not have been able to use it if that was the way it came.
Regarding sound: In Default and Flat it sounds fantastic, more forward than most Audeze house sound. In Music preset it sounds awful, like a worse LCD-2, like the treble and mids have just been chopped off.
Overall the DSP feels like it adds compression and only in Flat did it really have any sort of dynamics.
For $249 it's going to be a very solid headphone.
Did you listen to the headphone pre-fix or post-fix?