Mine has arrived!!!
Out of the box I paired with Auralic Taurus amp (not mine, unfortunately) and the result is fantastic, I could I stay with this rig for a looong time. Although I cannot compare with my DAC19 as I am using it with other amp and balanced outputs, sound feature is quite similar, detailed but natural, musical but not too coloured for my taste. The detail and timbrics are amazing, realistic and becomes into an addictive sound. Soundstage, at least first impressions seems to be improved too, more precise and it seems bit larger. I am starting to wonder 5.2 potential when it will be fully burnt.
I have to do a lot of tests and burning, actually using it by coaxial with Hiface2, so I will test with USB and as well with SE output to compare it with DAC19. I didn't ask to Kingwa so I don't know if these units are burnt 100 hours before shipped like DAC19 ones, I guess total of 300/400 hours will be needed too.
As has been said, it needs some time of heating at least right now, a little bit annoying as for me plug&play is main advantage against tubes, but when listening and enjoying it, it's easy to forget about that. By the way, mine keeps all settings after being 1 or 2 days switched off.
More to come after some hundred hours...