I have to say that I am really, really impressed!
I've had a few Technic sets from recent years, and this one is fantastic. The scale and detail of the truck is superb- the tipping cab to reveal the V8 motor is a really nice touch. The gearing is really well thought through, and the kit comes with the XL power functions motor, which means all of the motorised parts work incredibly smoothly. For instance, I also have the 8265 Digger, and the regular motor struggles a bit lifting the bucket under a load.
My one slight criticism is that the crane arm doesn't fold very smoothly at it's extremes. Also, the crane itself is not massively strong, and tips slightly when lifting a larger load. Both of these are minor points though- you really won't be disappointed by this set- it's a good length of time to build too, took me about 6 hours (and I loved every minute!).