My two cents...
I have previously happily owned the D7000s and sold them for the HD800s. Both are amazing headphones in their own right. But both are very different. The HD800s are as neutral as I've heard with unparalleled detail retrieval, sound staging, pure depth and control of bass and clarity. The D7000s are very fun with subwoofer awe inspiring bass, with slightly recessed mids (but still very good) and excellent treble.
So, it depends on what you prefer. I must say, the most impressive first 5 minutes with any headphone that I've ever had was with the HD800. The level of detail and sound stage imaging was just incredible. My wife still comments on how stupid the look on my face was when I had them on my head. But heck, in the end I prefer the T1s to either of these two cans.
To say that one is a crap is a mistake and simply not true. While it may not be your taste (and that's fine), to say that they are bad or a mistake is inaccurate to say the least.
Technically, I think the HD800s have the upper hand, but I can certainly understand why some prefer the D7000's overall presentation.
