I took delivery recently of a PM9 that had been modded by Cylinder & Slide. I bought the gun directly from them, so I have never fired a stock PM9. They performed a trigger job, polished the feed ramp and trigger face and extractor, crowned the muzzle, and performed assorted other goodies to improve reliability and accuracy. After doing a lot of research, I decided to go this route because of a nightmarish experience I've had with a Kel-Tec P-3AT's reliability, as well as reading many postings about inconsistent reliability among other CCW manufacturers (Rohrbaugh, Kahr, etc). I simply wasn't interested in acquiring another almost-but-not-quite-100%-reliable CCW gun. And I wanted more beans than a .380 ACP can provide.
To say I'm pleased would be an understatement. Reliability has been 100% since the first shot, accuracy and controllability are excellent for a CCW piece, and the trigger pull is easily as smooth as the DA pull on my S&W 686 revolver. All this in a sub-19 ounce full-power 9mm+P that's slightly smaller than a Walther PPK.
Yes, it was expensive. But the peace of mind that I have a reliable pocket-sized 9mm to protect myself and my family is worth every penny.