I have a Zorki 1, and two Zorki 4. Have had no problems at all with these cameras! Specially like the handsome Zorki 1 (bought them via ebay from Russia, haven't made any thing like CLA to them, just put in rolls of film and started shooting!). I would say: build quality quite rubust!
Posted som pictures in the "Bolshi Blads" group here on APUG!
/Bertil