Buying used gear is always somewhat of a "blind date"... you are never certain of how things will turn-out.
About 5 years ago, I acquired an "ugly" 1934 Leica III with peeling chrome on top of the RF housing, and a Komura f:3.5/ 35mm lens (black scalloped focus ring), I believe it was $150 from eBay.
Turns-out it had a sticker inside from a NY camera dealer, indicating it had had a CLA in the mid-1970's. It seemed to work well, and has become my "daily driver" LTM, and I have shot a couple hundred rolls of film with it.
My first Leica, was a cosmetically beautiful 1951 IIIf black dial, with a nice collapsible Summicron. This outfit was purchased from a well-known and respected collectible camera dealer. It cost somewhere around $700 in 2007 ( yeah, I probably paid too much... 🙄 )
At any rate, I shot a few rolls with the IIIf, and it seemd to work very well. Then I began to notice issues with what I thought was lens-flare, and began to suspect that my wonderful Summicron lens was the culprit...
After a few more rolls of film, with different lenses, it became evident that the "flare" was not from the lens... it was from holes in the shutter curtains, which were beginning to disintegrate... 🙁
Turns-out, the curtain material available to Leica for several years after the war was not as good as the pre-war material, and these curtains don't last as long.
So, in the greater cosmic casino that is "collecting old stuff", one "low bet" turned-out very well for me, and the other "high bet", not so much. ( I do not begrudge the dealer that sold me the IIIf - it was seemingly in excellent functional condition when I received it, and cosmetically it is still gorgeous... it just needs a CLA and new shutter curtains, so that adds $200-$300 to the $700 I already have invested in it... "more than it is worth".))
It is a safe expectation that ANY mechanical camera is going to need a CLA (cleaning, lubrication, adjustment) to function properly.
So, budget accordingly. If a camera is being advertised as "recent CLA", ask for the receipt as proof.
Generally speaking, the Leica IIIc is a good and reliable model: die-cast body, top shutter speed of 1/1000, generally reliable shutter curtains.
Good luck in your quest !
Luddite Frank