I did like them pretty well on my AD2000, which is supposed to be similar. Their haunting ballads actually work really well on the HD800-think Porcelina, Galapogos. It's the hard rockers like Siva, BWBW, Cherub Rock that I find lacking.
Pearl Jam and R.E.M. are phenomenal through the HD800. Radiohead haven't really jumped out as truly exceptional through this headphone. As much as I love this band (saw them live a few months ago) I don't really listen to their music much nowadays. I think I'm kinda burnt out on Radiohead.
I agree Pearl Jam and REM are also incredible on these. In fact, RH and PJ are the two 'rock' bands I love the most on these-although their stuff is definitely on the softer side of rock, and is easier for the Senn to excel at imo. The Pumpkins-not so much. Automatic for the People is truly remarkable on these headphones-it's uncanny how Stipe and Yorke sound so very similar at times imo. Pearl Jam's slower stuff is truly excellent on these too: Jeremy, Yellow Ledbetter, Given to Fly, Better Man and more are all pretty incredible-assuming you're listening to the remastered/remixed Rearviewmirror versions. The original Ten and VS albums sound pretty inferior here imo.
As for Radiohead-yeah you must be burnt out on them or something. ;) As great as REM and PJ sound on the HD800-RH is simply an astounding pairing that is untouched for synergy imo. I'm sure the ZDSE/DP1s' holographic nature have a lot to do with it as well. In fact, I'd argue one hasn't really experienced the best RH has to offer unless they've heard a topflight HD800 rig. Imo of course. ;) Here's hoping my TH900 arriving tomorrow can capture a lot of that synergy with RH-but I doubt it.