What a fun toy the Shake N Go Speedway is. First the track assembly was easy. Just be prepared with 10 AA batteries. Next to get the cars ready to race, just shake them (there is nothing to wind or pump... just a shake). This is a wonderful design, what's great about this motion is that kids of any age can prep the cars for racing all by themselves. In fact, I watched as a 1 and 3 year old both played with this race set for an hour. Each kid was more than capable of managing their own car. The race track is a good size and has interesting twists and hills which make watching the cars fun and interesting. The cars themselves appear to be well made and travel a good distance about 20 feet after about 7 good shakes. I also like the size of the cars as they are bigger than a Matchbox but not too big. The cars are even fun off the track as they run well on any reasonably hard surface. Even the sound effects of the race set are fun as they follow the characters from the Pixar movie Cars. This is great race set and will easily keep kids ages 1-6 busy for quite a while.
— Attributes that make this product a winner include: Interesting shapes Fun assortment of colors Parts snap together and apart easily In addition to these attributes the Knex products help develop creativity and hand-to-eye coordination in children.