Got a 3-month subscription for our almost 7-yr old daughter who loves to build, and she was ecstatic when she opened the first box! She got 3 simple robots to build, and HAD to build the crawl bot on the first night. She's trying to patiently space out building the others so she can share and show them to her best friend. Only minor issue we had was the quality of the double-sided tape provided - it wasn't strong enough for holding the battery pack to the body of the robot, so we improvised. She was definitely proud of herself after building the first robot and is excited to build the other robots and see what projects she gets in future boxes.