Pologirl A builders dream! - My 8 year old loves this! He was so excited when it showed up in the mail today. He opened it immediately and wanted to start building. Building instructions are easy to follow he can build on his own. He made it through 6 of the track designs before bedtime and still has a bunch left to build and try for another day. Pieces easily fit together and made well. He loves the magnetic cannon the best so far! If you have a kid who loves to build things then this is for them! Even Dad loved to build too! One thing I would like is a baggie or pouch to store all the pieces and marbles. We just used ziploc bags to keep things organized in the box and so we don’t lose the marbles. As an early reviewer, I received the GraviTrax Starter Set in exchange for my honest opinion.