Our boys (4 and 1 1/2) love this roller coaster! So far we have only used it indoors so I can't comment on its effectiveness when used outdoors. Our kids enjoy riding down in the car, but they also love to walk up and down the track and roll/race their toy cars and balls down it. Sometimes they just use one section of the track to play with their toys. My only negative comment is that the steps could be a little bit wider to allow more room to step up. Overall, fantastic product!