I never ever heard about Petri growing up. I'm 45 now. This spring I bought a 7S colour coated f/1.9 at an estate sale. I don't think in ran more than a few dozen films, based on the condition of the leather ever ready case it came in.
I like to use it in outside shooting, where the CdS metering I still find reliable. Mechanically the shutter cocking has gone wonky a few times. Needs a CLA, but I only paid $40 for the camera and a whole lot of flash bulbs.