I saw one review said the cars were bad. They really get cooking and yes sometimes come off the track, that is how they break. I called Artin and they sent me a. From the start, if I seem a little excited in this review it's because I am! like obtaining the parts and accessories will become easier thanks to Slot Car World. 8eyu.com: Artin Super Loop Speedway Slot Car Set: Toys & Games. GT Competition - Slot Car Race Track Set - Scale - Analog System - Includes 2 . 3) Speed and course- There was a lot of reviews complaining about controlling.