Not unless you want your fingernails painted red.
Back on subject, I wandered down into the HeadRoom/Senn room. Tyll was setting up and just unpacking a pair of the pre-production HD800s that they had balanced. So I got to be the first ever (according to Tyll) to hear balanced HD800s. I listened to one of the HR demo CDs from a Wadia > HR Ultra DAC > HR Ultra Desktop with HR Ultra Power Supply.
The balanced HD-800 is sublime. It's not a wow kind of headphone, everything just sounds right. It has just the right amount of bass, soundstage was large but not overly so, midrange was neutral but not analytical and the highs sounded right. It's the fastest dynamic headphone that I've ever listened to.
Later I get to listen to a production, single-ended version of the HD800. I asked the Senn rep what the difference between pre- and production models were. He says that there are no acoustical differences and that the main difference is the paint. He says that further testing showed the original paint to not be robust enough. If the production version sounds as good (or better) as the pre-production version, my pre-order definitely stays in.