There aren't that many bricks in the Duplo Busy Garage set, so it's more fun if you've already got some other sets as well. We got this set for our three year old son who loves taking the wheels and bonnets of the two vehicles and swapping them around.
The set comes with a special screwdriver that is used to attach the wheels. Once he'd been shown how the screwdriver worked he was able to use it easily and has had a lot of fun playing with this set.
The price of this set has come down quite a bit from Amazon since we bought it, so it's much better value now.