I bought this book for my upcoming Flash MX introductory class after having read some of the reviews here. I've been working through the lessons for the last two days, and am very impressed. This book is the first one on Flash that I myself has learnt much from, both regarding the program it teaches, and also - not less important - the general tips regarding sounds, animation, file size.
This is a very good book for beginners. You get good habits initially, and you learn what the veterans use years of trying-and-failing(-and-loosing-customers) on.
I have not yet found anything that's wrong in this book, no errors. (At the present I'm preparing hour 11)
There might be some minor stuff, like not mentioning ALL the ways of doing things, but that's not important before you go for certification as Flash Designer or Developer.
My recommendations!