The only problems I have ever had with a Leica, was with my M6, once when the circuit board governing the meter when bad and was replaced by DAG, and once when I dropped it onto the marble floor of DC's Union Station (sob). Both were repaired pretty efficiently and the M6 is running well. Overall, I have (except as noted):
M2, M3 DS, M3, M4-P (sold to purchase M6), M5, M6, M7 (sold to purchase Nikon D3), M9
Let's face it: the shutter springs are under-tensioned by design and will probably outlast me. I am a dilettante, an amateur, a weekend warrior. But I have to respectfully disagree, Ko.Fe. As mechanical devices go, they are pretty robust in my experience.
Now the OP didn't say he wanted professional RF gear -- he said he wanted "classic." Well, the Leicas are as classic as you can get. The classic-ist. They are the design that all the others were copying. And I think they are neck-and-neck with the Rolleiflex for the pinnacle of mid-century industrial design. Still, this is all in the eye of the beholder, hence the fun in the debate. I'd say that between 1984 and the tapering of my film use in the 2000-somethings, I made roughly 20,000 exposures, about half on 35mm film. So: nowhere near the life expectancy of even one of the shutters in any of the above cameras.