My son love lego technic very much. He is now 7 years od. When I give him this lego sets in made in 3 to 4 hours without taking any help from me. The good side is easy to install, learning toys. he loves to learn solar system, this toy help him to understand real structure of earth, moon and sun. It also helped me to teach him 2 kinds of solar eclipes and how it works. I am very happy to give him this lego set.
The only thing it is, the price is little higher than legos other products. Since, it is learning product they could make less price.