It sure looks awesome, and it’s very well-built. I did not listen to it long (I’d rather spend my time with pleasant headphones), but I did not enjoy it.

The soundstage is good for a closed back, but it sounds tonally extremely wrong. The HD 800 sounds like you’re in a live concert hall, the 820 sounds like a slightly smaller concert hall, but the singer is singing from a backstage toilet and has sinusitis.