So, I now have a choice among these "Korad clones" by a company called RND:
320-KD3005D (two knobs, no buttons)
320-KA3005D (one knob, with buttons)
320-KD3005P (two knobs, no buttons, with USB)
velleman LABPS3005D, replaced by LABPS3005DN, (one knob, with buttons, with USB)
and completely different models from UNI-T:
UTP1305
UTP3315TFL
UTP3315TFL-II
(not sure, what they have actually changed for the II version).
What do you think? Which, in theory, should be a more reliable choice - the Korad clones or UNI-T?
At least, we now know what to expect from these "Korads", but UNI-T models are a total unknown for now.