It is a well-written book and quite thorough when it comes to giving an overview of everything Disney related to pirates.
What made the book worthwhile from my standpoint are the pages about the movie Treasure Island which include quite a bit of artwork that I had never seen before. The section about Pirates of the Caribbean is also quite good although I did not discover much in it. At the very beginning of the book is one story sketch from the abandoned Goofy short How to Be a Pirate. I wish there had been a lot more about that abandoned project, which really intrigues me.
Bottom-line: this is not a bad book. For historians and history enthusiasts, it's a nice-to-have (but not a "must have") that does contain a few cool surprises.