In 1946 or 1948 my father came home one night with a brand new Grumman 15 footer on top of his car. Man, were we five kids thrilled! Since that time it has been used constantly by several generations - filled with water and floated around in, fished from, sailed with a home-made sail rig, pushed with an outboard motor on a home outrigger, used in the surf of two oceans, and is still going strong. The only time I know of where it was tipped over accidentally, was by yours truly, who violated the rules and managed to dump it.
To this day it is in excellent shape - no dents of any consequence - has been painted then sanded back to its original hue. Has tasted the waters of Maine, Vermont, New Hampshire, Massachusetts, New York, and Florida. Most of these years it has been stored outdoors in the off season, and nothing seems to bother it. If the rating scale were higher, I'd give it a better rating.