So far i'm very happy with my AD2000x. I wish there would be a bit more bass however sonys clearbass from my portable works extremly well without adding any obvious artifacts. The AD2000x can handle _alot_ of bass added by eq without problems, clearbass +1 is all i need for my tastes. Adding a rubber band to the wings makes them headbang compatible and fit just as tight as the old AD2000. The W1000x still gives me less problems with keeping the fit due to the pads so no rubberband necessary there. Both headphones are so different that they complement each other fantastically.
Good to hear that you are happy with ad2000x. I am also very happy with it :) Btw any songs you have tried that you think is amazing/special with the ad2kx? :)