My TH900 impressions:
Bass: Great, powerful, tight, emphasized
Lower Mids: Great, but little reduced
Upper Mids: Great presence, very clear
Treble: Great, very detailed and airy, but maybe a bit overhyped, maybe some spikes here and there, but great anyway. The D7000 treble spike of hell is not there woohoo! But still I wish the treble were more smooth.
Soundstage: Great, better than LCD-2, LCD-3 and maybe even T1
Comfort: Not so good for headphones this expensive. After an hour of wearing them my head started hurting from the hotspot on top of my head created by the poor headband. This problem was even worse on D7000. Clamping could be even more stronger, these will fall of your head easily.
Soundwise these might be the best headphones I´ve heard so far. It´s a bit of a V sound, but if you like that kind of sound, these are the ones. LCD-2s/3s sound muffled and sloppy after these.
Next step SR-009???
in simple words... the TH900 is Great!