I really like this track system. I'm 63 and I've always wanted a Tyco track, but I ended up telling my daughter should we buy one? I like it very much, easy to set up. Once we got the racers up to speed, they probably drove around the track ten times before they crashed. I think sometimes they crashed because they hit the spot where two tracks meet. on my carpet But I seriously thought about buying an extra caterpillar and changing the track of the caterpillar. Really glows in the dark. I thought that was the reason for the 4 stars, when I first read about buying the b4 I thought it came with USB charging too. But that's not the case. But yes, it only takes 10 minutes to charge the car.