From my perspective as a prop collector this will be an invaluable book.Very interesting with a lot of great detailed information and pictures of the bulding of models and such and there are some pieces of mine feautured in there I believe such as some interesting stuff about the pyro X-Wing models of which I have some examples and the construction of threepio is also detailed quite well I understand.I recently acquired an original third draft script as well so it will be interesting to see what it says about the evolution of the script from original through drafts to the final version.
Definitely a worthwhile purchase.Mine should be arriving soon.