I have 4 kids, 15, 12, 7 and 3. We got a large one with a net at the begginning of summer. The injuries we have had, minor sprains and bruises, have all been the teenagers who don't follow the rules! They aren't allowed on it anymore. The younger kids love it and as long as you supervise them and don't let them get too rough or do flips with more than one person on there it isn't any more dangerous than the swing set or the swimming pool I also have in my yard. I always wanted on when I was a kid but our yard wasn't big enough. I broke my foot falling off an unlevel sidewalk! You can get hurt doing anything.