Finally got mine today. I like them. The only decent headphone I have is a pair of modded D2000's and I don't have them handy for direct comparison but if I ordered the D2000's and these came in the box and I was a blind man I'd probably be pretty happy. One surprise is I was expecting something more semi-open and these are not very open at all in my (fairly uneducated) opinion. The isolation is decent, or maybe these just happen to seal to my particular head really well.
The pads are wretched. Or are they? I spent a few minutes stretching them radially (trying to make them bigger so they fit over my ears better) and now they're more comfortable. I was able to stretch them more than I was expecting, maybe about 1/4" increase in diameter. They did seem to sound significantly better after that, but that may be in my head, maybe they're burned in a bit while I was screwing with the pads, or maybe they just make a better seal now.
I may still grab some 840 pads though my only complaint at this point is how hot the pads get. Otherwise I'm completely happy with these bad boys.