I have never owned a Leica, only Nikon and Mamiya equipment. I have noticed though that there are several older Leica SLR's at reasonable prices. Mostly the R3 and R4 cameras. Has anyone here had any of these? If so, how durable are they? I did notice that used SLR series lenses are somewhat pricey, but not nearly as much as the rangefinder type lenses.