My sons (3 and 5) love all the Bob the Builder Lego Duplo sets and they ask for them out to play with all the time. We have a collection of them and the Thomas the Tank Engine Lego Duplo sets and the boys spend hours building the machines and trains following the instructions and building their own designs. They are all good quality and durable and the designs are well thought out for small children to fit together. My only critisism of the sets is that they are quite expensive (you don't get that many pieces in each set) but if you mix them together with standard Lego Duplo bricks it works out better value for money. I would not hesitate to recommend this toy for any Bob mad toddler or pre-schooler.