IDK, when I tried one DKC was completely unplayable. For some games it's very important. This has been a well documented problem with the cheap scalers.
They have other issues too and RetroRGB has a good video going over the problems:
Not all TVs support 240p over component either, especially from the late 2000s/early 2010s which means you can run into problems with some PS1 games on a PS2 or earlier consoles.
I am aware of all this. This is why I said that depending on the box it can be either total garbage or "ok". At this point any emulation is always going to be easier.
They have other issues too and RetroRGB has a good video going over the problems:
https://www.youtube.com/watch?v=ZUrqWN4AcJc
Not all TVs support 240p over component either, especially from the late 2000s/early 2010s which means you can run into problems with some PS1 games on a PS2 or earlier consoles.
https://www.hdretrovision.com/240p
These days there are clones of the RetroTink 2s and options like the ODV GBS-C that are decently priced and good options.