Excellent job on the video. I bought my WA7 a month or so ago and i have been listening to HD600's, Amperiors, and Triple Fi10's on it. I was not a fan of the way the HD600 sounds with it but the Amperiors sound awesome. The TF10, well jury is still out on that but for the price, the fact it handles IEM's with tubes, has a DAC scalable to 32/192, can be used with powered monitors or headphones by flipping a switch from "USB" to "D/A" and workmanship i think the price is justified.
Its like a swiss-army tube amp and i think it does everything really well with nothing much lacking.
Thats said i have no experience with other DAC's so i can't compare but i was thinking about running a Centrance Dacport into this from my PC.