If you keep their water fairly decent and feed them well, and you're lucky enough to get a male and a female, they will breed and have TONS of babies! Then the babies will grow up and have more babies, and you'll have them for a long time. Good luck with them.
I had triops once when I was little, and IMO they were much neater than the sea monkeys. They get pretty big (around an inch or so) and are quite neat to watch. The only thing is that they are cannabalistic, so they'll eat each other until the biggest one is left! Very neat little guys.
-You can search all day for something and never find it, only to see it in the most obvious of places after you've stopped looking.-