My experience (revolver only, 3 PC, 4 non PC) is that the new PC guns are put together with the same parts as the regular revolvers, with the exception of a bossed mainspring. Only one of my PC guns had any evidence of actual hands on care - a polished rebound slide.
The difference is primarily marketing - there's very little overlap between their standard line and their PC line. Want a 6" 9mm revolver or 5" 627 - it's going to be a PC. Want a 4" 686 - no PC offerings.
So if the gun you want is made by the PC, you have little choice in the matter. I've had to send both PC and regular guns back.