I bought this as a change of pace to Duplo blocks, which my 3-yr-old daughter plays with every day. The kit is fairly small, so it would seem that there are few things to create with it. Not so! She makes everything from satellites to lollipops and bouquets of flowers. She was initially interested in the "creature" creations but now finds the challenge of snapping the pieces into limitless combinations engaging. We found that creating the creatures was difficult, since the "feet" and "eyes" are oddly weighted and often cause your creature to be unable to stand. A child with better understanding of weights and balances will have more fun making creatures.Pros: it takes some dexterity and even hand strength to snap the pieces together. It has a nice, compact case with a handle. K'Nex teaches another kind of connection than the standard block. The abstract nature of these kits really engages kids' imagination.
Cons: A few of the pieces are a choking hazard to anyone under three. Even the long "sticks" could prove disastrous to a child that is unable to resist mouthing and running around. You child may need your help a lot in the beginning until they get the hang of how the pieces attach to each other.