Poll is for 250ohm version of these. I heard them at NAMM and they sound pretty nice. Some differences in sound between the models due to their open, closed, semi-open design though they all have the same housings and drivers. The larger earpads they come with feel much better than the small pads.
I would classify the TR-70 as a bit more highs, and of course noise bleedthrough and bleed out from your own audio.
TR-80 seemed pretty balanced overall to me and had the best noise isolation, though I would not say the isolation was amazing.
TR-90 has the best sound IMO as it had the most low end and only minor bleedthrough.