Thanks for the info, Gene.
Actually it was your review (complete with frequency response) of the HD600s that pushed me in their direction.
The knowledge that the RBHs are shipping soon is good enough

I assume you guys will be doing a proper review of them, and I intended to read up on them a bit rather than jumping into a purchase anyway. Hopefully they don't get buried too deep under the other things slated for review from this event.
I actually figured that Adesense worked a bit better with the advertiser at the very least for targeting viewers on Youtube. I guess it is no wonder manufacturers are sponsoring channels and paying for 'baked in' ads into content these days.