My Experience ...
with one was not very satisfying. First, a guy ripped me off by selling me one used which had a broken part in the trigger workings. He had rigged the broken part to work while dry firing, but during live firing the trigger would freeze up after 1-2 shots.
I share this because I attempted to have the gun repaired and can tell you firsthand that the internal parts used in same look like the cheap little stampings you'd find in a plastic pellet pistol. After seeing this, I surmised that once unserviceable, these guns were designed by the Commies be thrown away, not repaired.
That aside, firing the gun was unpleasant because:
1. 9x18 had a SHARP little kick to it
2. the slide bit the web of my hand without fail
3. the double action trigger was unusably heavy
4. sights are an afterthought not even usable on the target range.
5. At the time, extra magazines were hard to come by.
Incidentally, selling a used PA-63 in a Makarov-world really sucks, since the Maks are head and shoulders superior to the PA-63 and have more available accessories. Most people would rather just buy a Mak (I owned 2 East German ones - WOW).