Douk Audio. Any experience with any of their products?

I've seen several products under this name on eBay in recent history, including a tube preamp board that looks pretty impressive. Especially for the money.   They reference a pretty exotic Audionote preamp in the title.  

Douk Kondo Audionote

I noticed the url on the board, and decided to find out more. Turns out the entire website is blank. Assuming this was an error, I messaged the seller.

I was interested in learning more about the Kondo board, and tried the website to see what info was there, and I get a blank page. Just fyi."

I thought they might appreciate the heads up about the error. Instead, I received this response:
"Hi dear customer
wish you have a nice day
the amp board designed by our designers
so you cant find it
best regards
Douk-Amy :)"

Not exactly a confidence builder. I'd be interested to hear if anyone has had direct experience with these folks.
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I got their DAC on Ebay.  Quite impressive.  I'm very satisfied.  Integrates well into my all-Herron Audio electronics.  I use an Onkyo CD player as a transport, co-ax works better than optical.  Intend to integrate a PC as a streaming source to the DAC.

I understand they made some recent modifications to their DAC power supply, so their current performance might not be the same as previous. 
I bought from Douk on eBay an integrated amp with an LED dot matrix display - I think the same (or similar) to the ones found on Mark Levinson preamps.

It’s a hybrid unit - 70W rated power output with a 5670 preamp tube in the front end.

Just 2 analog inputs and one USB in.

It says "A.Audio" on the front - no other model numbers shown.

I’ve had it for a few months now, and it works fine, and sounds decent (at least to me).

I mainly got it because I’m into equipment that has LED displays that I can modify.

Overall, I’m pleased with it.
Hello. I have a DOUK AUDIO USB DAC. It replaces my previous Muse DAC.
In comparison, the Douk sounds much less congested and the music comes alive with lots of detail, a solid base and great imaging. 
I did have a problem with the driver that came with it.
I was getting TICS and TACKS at random while the music was playing but not on pause.
I tried everything under the sun to get rid of it but could not find the problem as I thought the problem was with my Dell D-630 when in fact it was with the Xmos drivers.
I did an update and now the problem is solved. 
This DACsounds great.

I bought their Dartzeel NHB-108 Clone. It's nothing short of amazing, by FAR the very best amplifier I've every owned ( and I've had Krell, Spectral, MBL etc, etc). The build quality is extraordinary. They also shipped super fast too. Couldn't be happier, in fact I like it so much I may well buy another one.
I found some images of the Dartzeel amp.  Looks amazing, but I don't think there is any connection with the audio kits and components sold on ebay under the Douk name.