As a former PF9 owner, my gun was trouble free. But any more than about 5 mags at a time was too much. That pistol has some recoil. The slide would rust real easy but it carried great.
I think the PF-9 is a great little gun at a great price and yes, I've shot one before.
You cannot defy the law of physics, the lighter the gun the stiffer the recoil, but if you ever have to use it in defense, you'll never remember the recoil.
Carry it a lot and shoot it sparingly.
I guess you could have the slide ceracoated or something or buy one with a rust proof coating already on it.