After auditioning these at length today i find myself very very confused by some of the comments and reviews Ive found regarding these cans and the HP200. At first i thought it was my gear, so i tried other sources, and other amps.... Then i asked for two other sets of ears.
We all came to the same conclusion: Yes the reviews are right these are severely under represented GREAT headphones... But the reviews were also wrong- with hip hop, electronica, etc and no bass boost on (out of the test sources and amps only the C421 even had the ability), these cans could be easily lumped into the bass monster category.
Ill compile a complete review once i spend at least a full day or two with these and build on it as time goes by, but these are my and my peers initial findings. We even pulled out some DT770 and 990, some FA003ti titanium driver editions, and several other bass heavy cans to compare- these not only stood up to them... But in most cases dominated them. No smiley V shaped sig, a full sound with extended and somewhat accentuated bass.