For me, this kit is one of the best 3 Lego construction sets that Lego has ever developed.
The other two are the LEGO Technic 8043 - Motorized Excavator and Lego Mindstorms (the newer with servo Motorenen). LEGO Technic 9398 - 4X4 off-roader but is also great.
The wheel loader is huge and as the Rauppenbagger crammed just as with technology. Zig gears, motors, actuators, special ... an absolute treat as you have realized the many features. Each Lego Technic fan an absolute must !!!
At least for me. 5 stars. Suitable for young and old alike. Actually recommended for anyone technophiles.
EDIT: There are different engines 4x, 2x IR receiver, 2x IR transmitter and of course the battery box included.
Thus, the wheel loader is fully remote controllable. 4x functions: move forward, backward, right, left, tilt bucket and shovel go up and down. So all the functions of a real wheel loader.