The only thing negative I can say is that I wish there were more sets! There are only 3 sets plus the starter pack, which might be enough for some people, but I want to have this thing going all over the whole wall.
The loop doesn't work every time,with all cars, but almost. The various sets don't work with the camera car because it cannot fit through the flip drop and other returns. Some cars are too fast, some cars too light, but it makes it special when a car does all the stunts. I had 3 sets hooked together going around the corner onto the other wall. This is endless fun, and you can get more command strips and set up numerous combinations or set ups. It's modular so you can swap stunts. I was not into hot wheels anymore and now I am because this keeps it up off the floor, yet I can play any time.