About to pull the trigger on a Konica III... what to look for?

I have found a Konica III for very cheap, and I'm about to pull the trigger on it... it would my first true rangefinder camera.

I am aware of some of the quirks of those cameras, but for those that have used them, is there some things that require special attention? They are fully mechanical, but what are the common failure points if anyone knows?

TIA, curious to know more about this camera.