Our child is 5 years old and a size of 1m15. The Swingball becomes complex for him compared with the conventional model: the spiral brings an objective of nice games but requires a sustained rate of strikes (for adults and teens) ... If we let a little drag the pace a little or be struck evil, rope quickly wraps around the main axis of Swingball either by rigid plastic rod situated before the ball by the weight itself of the ball (which sometimes landed in the face and hurt a little for that matter!).
So: for children is tiring fast enough ... even daunting! But for teens and adults, it's great !!!