I just came back from Dan's mini-meet...and I can't say I agree with this. The first thing I did when I got back home was to put on my HD800's. The Ethers don't "beat them like nothing" in anything. They are, however, just a good as the HD800, but with a different presentation. IMO, they are equal to the HD800 - they are definitely in the same league. This is quite impressive since the Ether is basically hand-built from scratch in San Diego.
What I really like about the Ether is that it offers quite a bit of isolation. Wow. I have never heard an open headphone filter out so much room noise . Oh, and they are so light and comfortable. Wow again. I really resisted the urge to hug Dan for giving the world such a wonderful headphone.
I'm trying to come up with a good excuse so I can convince myself to buy the Ether. I would never sell the HD800 to buy an Ether...but if I didn't already own the HD800 and I was looking for one end-game headphone I would have a really, really hard time deciding between the two. I believe I might chose the Ether because of the impossible isolation it provides.