Power supply technically doesn't work (look at all that rectifier tube rolling) and the amp circuit is terrible so not something I've ever recommend. For me it ticks most of the "fuck it, let's just make some money" boxes. 6SN7's driving 300B's is always going to suck but marrying it to cheap as dirt iron from China with a PSU which breaks all the rules for tube rectified PSU's just takes the cake. There are also small issues such as how the filaments are done (AC with a hum pot... in a headphone amp) and the Woo spirit of slapping on some upgraded parts that don't matter.
Same can be said about the DNA amps, they are pretty much terrible and again, dirt cheap transformers and fucked filament supplies/PSU. I'm well aware how expensive iron is but opting for the cheapest off the shelf Edcor unit is just fucked. Alo Studio Six is also guilty of this as well as one of the worst tube amp designs I've ever seen.