I have used both metal and plastic cassettes. There was only one time when there was a problem and that was with a plastic cassette. The end cap began to untwist as the camera was being loaded. Never any problems with metal cassettes. At one time Kodak sold the best reloadable metal cassettes. The metal was quite sturdy. Today's reloadable cassettes, both plastic and metal, are a bit flimsy. Before you buy a lot of any brand see if you check their quality. As with all things you get what you pay for.