They're unbranded Chinese boards made specifically to take advantage of older used chips now being much much cheaper. I have not seen any reports about their long term durability, but they do seem to work without issue, though the lack of any cooling on the VRMs is a big deal. The VRMs will run very hot.
I would not recommend getting one personally, even as a side project.
Why do you ask? What are you trying to do?
i7 7700kK @4.2ghz
16GB DDR4 3200mhz
GeForce 1080 Ti