My son was thrilled with the robot. He quickly assembled the first model, the spinning mills. Even the engine itself has been tried in all possible situations. In this respect, a direct hit. So much for the game charm. Now the material quality. In fact, the connectors have some problems are partly, the resolve to loose to elements by the vibrations, sometimes very firmly, so that conversions are difficult. I probably would not pay the original price, but the price reduction I have come to a favorable gift that makes a lot of joy to my children.