Really quick update...
I tried them for about 15 minutes this morning, and absolutely no bass energy below about 40 Hz. When Dan says make sure you have a seal, REALLY MAKE SURE YOU HAVE A GOOD SEAL!
I pm'd Dan, and he walked me through the seal. I actually had them too loose, and once I tightened or shortened them a bit, I had a good clamp.
I was able to play 'Elephant Talk' by King Crimson, DVD-A mastered by Steven Wilson. I have one warning, what Dan writes about these is not hype. These are possibly the most neutral headphones I have ever experienced. The graph he posted, well, yes- that's what neutral sounds like. Everything seemed proportional. The mids have to be experienced, IMO. Descriptions just won't cut it, at least not with my vocabulary. Bass will definitely sound recessed, especially if one is used to my other less-than neutral cans. But it is there, and I have not even tried to explore the limits of the depth. So far I have about a half-hour with them, so take this all with the usual grain of salt.
Soundstage I'm not too concerned about yet, but the imaging is darn good. I'll try out some classical and live material, and some binaural material in the next few days. I also plan on using some EQ from JRiver with FLAC files and see what they sound like with a more U-shaped EQ, and how responsive they are to fiddling. At this point, I do not intend to mess with the screw, at all.