It's a great guide for anyone who wants to get a full experience from this amazing game. Just a correction, I ordered it here from play.com, and the book is not 450 pages but really more than 500 pages long, because it includes all the maps in the end of the book. :)
A little warning to anyone buying this game after seeing one of the hundreds of youtube videos or forum threads about glitches to duplicate items, get infinite gold, train skills faster or any of that other stuff. this edition of the game is PRE-PATCHED, meaning you can't do any of it.... not that you would want to... gotta play the game fairly 'eh...? *cough*
This guide is a blessing to the game, I agree some of the information especially the quest's can be obtained on the internet, but the fact that the book is beautifully put together and really strong, this makes an excellent companion to an excellent game.