I just came across this product, it is freaking expensive and they are marketed with what Tesla drivers. Anyone can enlight me what is this? How does this even fare against the DT880 and 990s, also how does this compared to HD800s? It costs almost the same as HD800!
I can't tell you how they compare to anything else, seeing as I've never heard of them, but the Tesla drivers indicate that they generate over 1 Tesla of magnetic flux density. IIRC, Beyerdynamic is the first company to produce anything like this, and may still be the only ones, but definitely don't quote me on that.
If you care to read up further:
http://en.wikipedia.org/wiki/Tesla_%28unit%29