I had an M5 and an M6 a couple of years ago. I liked the M5 way better. The metering is easier, just cross the 2 needles, and the shutterspeed is visible in the viewfinder. As has been written, the shutterspeeddial is also much easier to turn without taking your eye of the viewfinder. The M5 dial can also be set in between the shutterspeeds. Try to get a 3-lug model, the shutterspeed dial on these models has clickstops and thus doesn't turn to easy.