Superworms are a different species than regular mealworms, and they take longer to develop. The main problem with breeding them, though, is that they are cannibalistic, and if they are kept in large numbers (which most people do) the population pressure keeps them from pupating. They will just grow bigger and bigger, which isn't necessarily a bad thing. But if you want to breed them, there are two methods. If you don't have a huge colony, you can just create hidey holes for them to use to get away from the other worms. Stack egg crate, fold up hand towels or paper towels, that sort of thing. If you have a large colony, you will need to remove the largest worms to allow them to pupate. I've put them in film canisters (back when they existed!) and into trays with little compartments. The worms will curl up into "C" shapes before turning into pupae. Then just check the pupae periodically, and when they molt into adults add them back or put them in a new bin. Be careful handling them, though. They have a chemical defense that will make your hands reek!
I haven't raised mealworms or supers in a while. I currently keep feeder roaches for my geckos and tarantulas, and I can't wait to watch chickens chase them around.
If you aren't squeamish, roaches are very easy and cheap to keep!
Jennifer