If you child/grandchild is 3-5yr old and has watched the "Cars" film, then the scene when the "naughty cars" appear and tease "Mac" when he's falling asleep on the drive to CA, is a MUST to act out at home. Simple tools required; Disney Cars film (Check), Mac the truck (Check), and then the 4 naughty cars (Boost, Wingo, DJ and of course Snotrod!) and most importantly "a vivid imagination" (3yr old check).
When buying any of these Cars, l highly recommend the Mattel Die Cast, they are extremely durable, bright colors, realistic and limited plastic (unlike many of the other manufactures).
Insider Tip: Buy these cars separately if the recipient is going to actually play with them. The combined sets are collector items and way over priced.