I have this plate as well and like it very much.
It is not really flat but much less textured than the standard PEI plate.
You should print it with standard PEI settings, not with flat epoxy settings because this is for another really flat epoxy plate from K1!
I had same assumption originally but failed to print anything with the flat settings.
Anyhow, most PLA and PETG stick a bit less - or much less - on this print plate. It really need to be completely clean or you need to use 3Dlac spray (I would not use glue stick because you see it on this plate too much on the model).
You maybe cannot use it for large tall models but for example the models from my PETG comparison printed nicely!