This is a great set, and I almost prefer these over the other stomp rocket kit. the only drawback - small kids (4-5 or younger) often don't have enough weight to make the rockets really get up and go. an adult and really launch these up there, and so can little older kids. Fins will eventually get torn off the rocket. a quick fix with some hot glue and you are back in business. consider buying some extra rockets, you may want extras down the road.