I have to say that if the W3000ANV really require a specific amp to work right then producing only one amp for every ten headphones is a very poor decision.
However, I don't think it's the case. After just 32 hours burn in, the W3000ANV already sound MUCH better (note that I only listened to them for a few minutes a few times during this burn in period, so this is NOT a case of my "getting used to them" - haven't used them enough for that).
Anyway, I think they sound enjoyable now. I say enjoyable because I certainly wouldn't define them as neutral. They most definitely have a "sound" - kind of a spotlight on the presence region, which like any coloration works better on some music than others. But the bass has enough weight to make the overall balance work well enough, and the cupped hands coloration seems to be gone.
I like them - they will make a nice change up. But they certainly would not ever be able to be my only headphone.