A really nice model that pneumatic and electric actuators provides. The guide is unique up to 2-3 points and the structure worked flawlessly. Because where force is required (eg the arm) has placed on the actuators where pneumatics was possible, it was also used. In contrast to the Unimog, the operation is also clearly indicated by the symbols. The battery compartment is fitted centrally, so that the model is level (the Unimog is unfortunately wrong, but it has also a suspension). The steering is working properly, also in the state. In the Amazon description wheel steering is inside, that's wrong, is directed "only" front double axle. Negative I can not tell much, the actuators crack quite violent in the end position, the pneumatic needs some time to work, and the B-model manual is not in book form. Overall, you get a lot for the money with rich Lego Power Functions.
