Well, I popped in Avatar on Blu-Ray and went right for the action scenes.
Headzone + D7000 = OMFGAWESOME
Though I'm returning it, I WILL definitely be missing what it does to Blu-Rays. Talk about immersion and quality. It's amazing.
It's a damn shame most the overwhelming majority of Blu-Rays are DTS encoded. I would be SO happy if the Mixamp could decode DTS.
For gaming overall, stick to Dolby Headphone as it's 100% of the positional performance that the Headzone provides.
$1100 amp just for movies = overkill... and I never tend to watch movies alone, so it makes sense to return it... but boy, it's awesome.
For $500, I'd buy it, easily. For $1100... it's massively overpriced.