I had read descriptions of the double-action trigger pull of the P-64 that made me consider surgery to add a bionic trigger finger before shooting this gun; that turned out to be unnecessary. I had also read about the fearsome recoil, but thought, "How bad can it be?"
A quick online order later, the P-64 and spare magazine were on the way. J&G Sales helpfully offers a Wolff recoil spring and hammer spring replacement kit right on the same page as the gun, and I had them shipped together in the same order.
The friendly folks over on the Unofficial P-64 Resource Message Board guided me through the spring replacement and cleaning procedures, and having finished those, I headed to the range at lunchtime today to see if anything blew up. I took along my Kahr PM-9 for comparison.
In preparing the pistols for shooting, I noticed the similarity in overall height and length compared to the PM-9. However, the P-64 is much thinner, more in line with my Ruger LCP.
Shooting the P-64 was a great deal of fun. I was glad I had replaced the recoil spring, because the recoil is still strong with the 22lbs. Wolff spring. It is far from unmanageable, though, and if you're used to shooting a small polymer-framed gun like the PM-9, or a light .38 snubbie with +p rounds, the modified P-64 is no big deal. The double-action trigger is still a bit stiff after the hammer spring replacement, especially as compared to the PM-9, but not bad at all. I'd compare it to a Walter PPK in that regard. And, the P-64 single-action trigger is delightful - short, light, and crisp.
I shot the gun pretty accurately at 7 yards, just a bit low from center. The sights are small but usable, and I found that the gun points naturally.
All-in-all, the modified P-64 is an amazing value, with a double-action trigger with decocker for safe carry, low weight and a slim profile for concealment, and a round which offers 25% more power than a .380 Auto, for less than $200 shipped with accessories. This one won't replace my Kahr PM-9 as my daily carry pistol, but it will be perfect as a knockabout gun. Now to stock up on 9x18 before everyone else does!
Tony
. I had considered using it from trading stock until I shot it! Now I can't imagine getting rid of it. Like Morne said, it is the perfect pocket gun when you don't want to carry that double stack beast in your waist! 
nice thing is you can buy them cheap! I think J&G sells em for $159 or so.