"Even though this is recommended for ages 5 to 12, my 3.5 year old was able to put the pieces together by himself. He only asked that I help him find a few pieces. He was able to piece the Stunt Truck together in about 20 minutes. The suspension system was really neat to install, because the pieces look like red megaphones. You would not know what these pieces were for until you get to that step in the instructions.
The one drawback, and the reason for this review, is to alert you to the weak connection holding the roof onto the truck. When my son's hand holds the Stunt Truck from the top, even gently, the roof pops right off. This echoes the feedback provided by some other reviews. It was ok because it teaches my son to patiently replace the roof, and go right back to playing.
Otherwise, this set was great fun to build. We have a number of Speed Champion cars, and because the Stunt Truck is the same size, we are able to play with them all together."