I have heard of the safety drum breaking. For this reason, I lower the hammer with my thumb when decocking my P64.
The recoil is pretty sharp, and I say that as someone who enjoys shooting full power 357mag and 44mag revolvers.
In my case, I begin to feel the pain in my pinky finger against the finger extension of the mag. The heavier Wolff recoil spring helps a lot in this regard.
I bought mine early on in the import cycle. At that time, nobody wanted them, and I paid $139. Made in '74, it looks like new, and has a discrete import mark under the dust over. The DA trigger was unusable in mine until I installed the lower power mainspring. I also did a little polish on the inside right side of the slide, as it seemed the trigger bar pushed out against it when pulled. I keep that area lubed. The DA trigger is very usable, now.
It has been completely reliable with anything, including JHP loads.
The P64 is so thin, it is easy to carry IWB, and fits in most PPK holsters.
After I got mine, I bought a surplus Polish shoulder holster. These were dismissed as junky and were about $5 online. I darkened the unfinished leather, and it looks much better. This rig weighs next to nothing, and the P64 is very comfortable to wear this way.
I just wish some genuine military surplus ball ammo would show up cheap by the spam can.