So, I got the adapter and sadly, it strains my eyes a little under Windows 10 LTSB 2015 and Ubuntu Mate 20.04. Moving windows and scrolling is slow, watching videos or full screen gaming is not possible. The CPUs are working quite a lot when screen content changes. What's interesting is that there's a green LED on the adapter that blinks (almost) every time something is refreshed, even when the changes are small. I turned on and off temporal dithering in the proprietary Nvidia driver, and then... nothing happened, as expected. Neither the LED blinked, nor the CPU worked harder. There is heavy banding in any mode, not sure where it's coming from.
There are some annoyances: the Windows 10 cursor blinks every second, and getting the adapter to work with different Linux distros can be a pain - don't expect much support from the Internet.
Because I experience some eye strain from the adapter's video output, it's not a good solution for me. Reasons for the eye strain? I don't know much more then before.
DisplayLink has potentially faster USB 3.0 adapters, but I can't test them because I don't have USB 3.0 and my PC is too slow.