Hoo! Many interesting, informative, amusing threads here.
As the (new) owner of a 1954 Leica iif, after having taken it out for its test run and putting two rolls of Ilford B&W film through it, I can happily add it to my list of quirkiest cameras - a reviewer on another web site described the Leica LTM as looking "...like the superstructure of a 1900 Dreadnought battleship" which, I think, sums it up well.
My iif was a one owner camera and came to me after several decades of sitting patiently in its leather case on a shelf. It fired up well after a run-through of the speeds and the Summitar (with pristine glass) was a bit stiff at first, but has now loosened up nicely. In all, this iif still works wonderfully well, tho, in fact almost as new, and the Summitar 50/2.0 lens I got with it has produced some amazingly sharp images. So I'm a happy quirk-user...
What is even better, an elderly neighbor who was once into Leicas noticed me snapping away at local landscapes and produced a collapsible Summicron 50/2.0, which he kindly gave me. This 'cron is a little hazy and will be dismantled and cleaned next month, but hey, not a problem - it's win-win for me, quirks and all.