Beemermark
Veteran
Thought I was hard on cameras but the rewind knob is about the only thing I never broke on an M4. Did wear the skin off my index finger a lot of times trying to rewind my M3 as fast as possible 😡M4's are nice - but the rewind gets easily bashed up -.
The M3 an M4 were the best built cameras ever made by Leitz. Period. The M2 was a cheaper model, sort of an entry level. Not that it really matters in practice since all 3 are pretty much indestructible. The M4-2 was a cheap disaster and almost caused Leica to go out of business; it had such a bad reputation when it was first put out (I guess it was the M5 that almost did Leitz in, very few buyers accepted it).
It seems that people today prefer nostalgia over form and function. Good enough.
BTW I have an M7, M4 and M2 currently. M7 get 90% of the use, the M4 maybe 9%.