Well, I bought an OM1n, with a 50 1/4 lens. Also bought some of the Wein batteries and the meter seems pretty accurate, when compared with an iPhone app meter. I'll probably only be shooting B+W, so it just needs to be accurate enough .
Haven't run any film through it yet. The foam at the hinge is a bit frayed and sticky, although the camera seems very clean inside. Not even sure where the mirror foam is...
I know a good repair person, so I suppose I ought to get them to CLA it. Was hoping to get away without having to do so, though. Is it worth running some film through it first, perhaps?
Thanks for all the tips everyone.