So: update. I've shot this pistol quite a bit, got a replacement mag from AIM after I sent the OEM one back. New one works flawlessly, and holds 14 rounds.
I've shot this Hi Power back to back to back with my SIG P226, Beretta 92FS, and Glock 19 on several occasions, and the Hi Power seems to have slightly more recoil than the SIG or Beretta, which seems strange to me. I still haven't ordered a new recoil spring or hammer spring, but will.
Getting used to the sights and trigger and can how hit with it at will. However, after a mag or two, my trigger finger hurts when shooting the Hi Power. Something about the recoil characteristics, or the ergonomics/close reach of the trigger, or the shape... it's almost like trigger slap feels. I get none of that from the SIG or Beretta.
I really want to like this pistol. I've seen custom/flatter/wider triggers... anything else I should consider?