I've never used rangefinders much, so disregard my comments if you like
I have an old FED-2 which has a
very precise rangefinder. Since they can be picked up for a very low price - and in any finish you'd like and a few I wouldn't - they are worth it just to play with. There are three drawbacks: 1) Weight. Think T-34... 2) No lightmeter, but "sunny 16" works fine. 3) Some long Leitz lenses can only be dismounted with the aid of a finger from the inside, as I discovered when I tried a Hektor 135mm on mine.
So I have another one, with the opposite drawbacks: Bessa-L. No rangefinder, but very small and light. Specially made for very wide lenses, where DoF is great enough to make a rangefinder somewhat redundant. Has a (good) lightmeter, but also works very well without batteries (important to me, to use on oil rigs without all the paperwork pertaining to non-Ex equipment).
Scale focusing and guess exposures is a matter of practice, and after a while you won't even miss what you don't have.
I learned photography with a Welta Welti, a folding 35mm camera which is even more compact. No lightmeter, small viewfinder, no rangefinder, but a very nice Tessar 5cm f:2.8 capable of top performance.