Here is my quick impression rating 9 after the audition of the HD800 this evening.
The headphone have only two day brun=in which mean demo time 2 days so whose people going on the later date the SQ will be better.
I will say that so far it the best SQ dynamic headphone from Sennheiser very much better than the HD 600 and the HD 650.
Goody bag have a HD800 brochure and a special cut audio CD from Stockfish.
Equipment used in the audition at the place are Lehmman audio Black Cube Linear headphone amplifier and T & A SACD player also most of their CDs are from Stockfish.
Finally please bring your own CD for the audition, 1/2 hr is short as you will be entertain with a short video of the HD 800.