I did indeed, and it's worth every penny. The manual is a massive thing, packed full of pics of the Porsche factory and how they build the cars. The model itself is put together in the same order that the car is built in, i.e. you make the engine & PDK 'box first, then you make the base chassis, then you mount them together etc. Took me a good few hours to build over about a week, and it's absolutely huge too. I'm hopeful that Lego will do more of these, maybe something from McLaren or Ferrari seeing as how they already produce smaller versions of those cars already.
Not cheap, but I got mine from a chap on PH who does bulk buy discounts. StevoD bought one for his Dad at Christmas, think it was about £150 from memory which is an utter bargain.