This is a nice set if you kid is a Cars fan and plenty of bricks to play with. I just deducted one star, because the there is a full sticker sheet for the different MACK paints instead of using factory painted ones that we prefer, as there is a much less wear and tear with paint.
Also be aware of the price fluctiations, I bought this set earlier for less than 20 pounds, which is an excellent price.
About the Cars Lego franchise: if you check the catalogs you can count 5 different Lightning Mcqueen and 7 Matters, which is a bit extreme, as differences are limited to a few bricks only. However there are a couple good sets with cars not available alone, therefore if you really an enthusiast concentrate on the big kits first before buying single cars.