I've never shot the metal PT22, but I think it's about identical in performance. Great little guns. especially for the +/-$200 price.
Just curious as I have yet to shoot the newly designed poly PT22.
Agreed on the bang for the buck value/performance. If you shop around you can find them NIB for $190 here and there which is a steal. I have the Beretta 21A and they both run the same with good ammo.
Hard not to like the little guys (I started collecting mouse-guns a year or so back and man do they multiply fast!).