Depends solely on the builder and design. Particular models of various makes (Cruisers, Azimut, Carver, SeaRay come to mind) have been notorious for developing leaks over time, due to hull flexing torsion or pressure from the weight above. Then there is the vulnerability to pilings (on flush windows) and the pulpits of other boats. Boats with designs like that are guilty until proven innocent to me, though aesthetics (often accompanied by resultant ergonomic issues) get them almost always thrown out of consideration anyway by both Ann and I.