The collector's edition does not add much (it was the same price as regular so as to take), the box is certainly more pretty, but all the goodies are not equal an ugly poster, which is an artbook actually a screenshot of the book, I have not had the medieval castle to cut and mount the "seals" are made of cardboard and plastic (bookable younger).
What is interesting in it is the collector version required for download, the throne room and more especially the CD music (because they are so much fun).