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I have one that I like quite a bit. It's rather small so recoil can be snappy, but I still enjoy shooting it. I've also found it to be quite accurate. As far as function goes, the factory springs give you a trigger pull that is a few pounds heavier than "too much." You can get a set of replacements from Wolff (recoil spring, firing pin spring, and mainspring) that will significantly reduce the double action pull weight into a more reasonable territory, but still heavy enough for safety in DA mode (in my opinion).

My copy of the pistol has trouble feeding Hornady XTP HP ammo, but has fed everything else I've tried just fine. I have a small stash of Silver Bear HP that I still need to try running through it, since many people have more luck with that than with the Hornady. My pistol's feed ramp is a bit rough which would explain the problems, but I'm fairly sure a competent gunsmith could polish the problems away easily.

A friend of mine also has a pa-63. His feeds the Hornady ammo just fine, but after doing the same spring replacements that I had done, he was having trouble with occasional light primer strikes on FMJ Wolf practice ammo, so he swapped the originals back in and gets the heavier trigger pull.

Overall, my opinion of the PA-63 is that it's an unbelievably priced gun that makes a great range toy, and as long as you figure out what conditions it works reliably in (like you should with any gun), it can serve as a conveniently sized backup concealment gun as well.