Serial #350 reporting in!
These look and sound gorgeous. IMO, they sound like a closed version of HD650 with more bass. While slightly overblown in quantity, the bass is textured, detailed and deep, very good quality. The mids are lush, intimate, and actually every bit as good, if not better than the Senns! What surprised me most is the level of transparency in these cans; despite being bass heavy they are very resolving and I could hear things that I could hardly hear on my other headphones more easily. I'm extremely impressed and most likely will be keeping them for a loooong time.
Next step: Pad rolling! (gonna acquire some TH900 pads first)
Here's another shot: