Bought this for my 3 y.o. nephew for Christmas. My dad spent some time putting it together. Then, we put the car on it, and "vrooooom", round the corner and off the track. Tried again, same thing. I guess that's why it's called Piston!! It literally shoots off the track at a very high speed. Could really hurt someone. Finally got it to go around without flying off. And then, after 15 or so mins, nothing. Just stopped working. My dad is an electrician, so he tried fixing it, but no luck. It's absolute garbage!!