I'm considering buying a Canonet (original model, not one of the QLs, since they're too expensive for my tastes after the QL 17 G III got on a bunch of to-buy lists). One seller has this video showing the camera's condition, which is far more than anyone else provides:
In it, the one thing that gives me pause is that opening up the aperture from fully stopped down to fully open has a bit of a delay. I'm not concerned about that itself (it will take me that long to take a photo anyway, and I don't plan to use it in shutter priority), but I want to know if it's a sign of something deeper that I should be worried about.
There are several other options for a similar price that don't mention any issues like that, but I'm not sure they would anyways and so it's buying something with a known problem versus buying something that's a bit more unknown.