What reliability issues?
Interesting comments re reliability. RMT: What was the failure of the safety?
I've had 4 of the P-64's, sold two of them to friends (that love them), and kept two. I shoot 95gr TMJ Blount for practice, and 95gr Hornady JHP and 70gr Pow'R Ball for carry. After many 100's of rounds, I've never had a fail-to-feed, or fail-to-fire, nor a hard mechanical (component) failure. At least in my hand, the P-64's recoil is less uncomfortable than that of my Glock 30 and a number of compact 9mm and .40's, and it's easily concealed, is just as accurate, and is an effective self-defense firearm with ammo like the Pow'R Ball. The S/A trigger pull is smooth and glitchless with virtually no perceptible "staging" or hammer drop threshold, so helps to reduce "flinching" in the hands of shooters who might be prone to flinching. The "surprise" hammer drop is a plus for control and accuracy in my opinion.
BTW, in addition to my application of moly to the trigger components to improve the D/A pull, I also apply moly to the detent c'sink (pocket) on the safety lever shaft. That detent c'sink can be accessed by removing the slide from the frame, and rotating the safety to the "safe" position. The detent is located on the right side of the slide, and the safety doesn't have to be removed from the slide (as it must in the Walther PP's) to be lubed. In the "safe" position, fill the detent c'sink/pocket on the safety shaft/axle with moly paste, operate the safety a few times, re-fill the detent pocket, return the safety to "fire" position, re-assemble the slide onto the frame. This has really smoothed the operation of the safety on my P-64's. I've also done this on my PP's and P-38's, but it's a lot more work involved on them, as the safety has to be removed from the slide. Moly paste is great stuff for sliding, high friction surfaces.
PS:The number of broken safety levers that I've seen on Walther PP's, leads me to believe that people try to remove the safety by trying to pry the underside of the safety lever away from the slide with the safety in one of the "detent" positions (and maybe without clearing the firing pin from the safety shaft/axle). Almost guarantees a broken safety lever....