For many Lego Technic fans this particular set is considered one of the best sets in the Lego Technic Series. The level of detail and functionality embodied in this set is extraordinary to say the least. Construction vehicles are good subjects to model because they can do more things than cars. Cars just have wheels that roll and maybe steer, and doors, hoods, and trucks, that open and close, and not much else. Construction vehicles like this very highly detailed bulldozer model are more fun to look at and play with. The motorized treads on this model really set it apart from all the other Lego Technic vehicles. It is very challenging and fun to build. I only like to assemble a small section at a time on these models so the fun of building the model can last longer. When I am done I put them on display on a shelf. The people who visit my house are just fascinated by this model when they see all of its detail. It is a beautiful thing to look at. I am very happy I own this model.