went and bought this in argos it is legos biggest technic model and has well over 2000 pieces took me maybe 6 or 7 hours to build some bits are challenging but i eventualy got there you have to build up everything including the diferentials and gearboxes the jib on it works via a small compressor and 3 valves, it also has working steering and suspension . would say this model would be good challenge for some people. if you already have it would be nice to know how you found it to build and operate
heres some pics