I guess the only real way to explain how I feel about this book is to say that the book is to me what the island is for Wil.
It pulls you to it because there is something in the book, something there that you must learn, must know and know well that keeps you in the book.
It's very well written and it just pulls you in and keeps you there until the very end.
In fact, it keeps you there, in the book, on the island, with Wil even after you have finished it and moved onto a new story.
Highly recommended to all.