Obviously, a book of this size always has some chapters that don't match the reader's skillset or experience, but I found these chapters easily identifyable so skipping them was no issue.
My main complaint is the somewhat dated typography and layout. The book "MacroMedia Flash MX 2004 Advanced for Windows and Macintosh" was more of a pleasure to read. But that book doesn't reach the comprehensiveness and doesn't go as in-depth explaining things.
As always, computer books become dated before you know it -- I just noticed that the 2004 edition is coming out. Nevertheless, I found the MX version of the ActionScript Bible a very useful and valuable read and reference. If I didn't already have this copy, I'd definitely buy the 2004 version as a must-have for the Flash developer's bookshelf.