I bought a Kamigami robot as a gift at Christmas for a young family member. He was too young to build it himself so I put it together. It was so fun I played with it for 2 days before I wrapped it up. I bought Scarrax so we could have dueling robots. Two were even more fun than one. I found the directions relatively easy to follow and both robots have held up well in spite of numerous crashes into the wall and robot to robot collisions. I like that the robots are rechargible and don’t need batteries. They run quite a long time before needing to charge. I’ve downloaded the app to my phone and iPad and haven’t had any problems.