As I have books 1 and 2 of these series, which I am in love with for they give a brilliant overview of all possible cake decorating techniques, I was slightly disappointed by this book. Don't get me wrong, it is not a bad book and better than quite some other cake decorating books, my disappointment is only based on the contrast with books 1 and 2.
Where #1 and #2 cover real cake decorating techniques, to be handled without much fancy equipment and very useful for beginners as well as those who have enjoyed cake decorating for longer, book #3 holds mostly extra techniques for which special equipment is necessary. It is nice to know what molds are available, how to use them and even how to make them, but this information is easily found online.
The book holds a couple of nice cakes, but for a SCHOOL of sugercraft, not enough classes are being given. It is a book that I have browsed through only once while my other books are used much more often. My advice would therefore be to stick to books 1 and 2 which covers all the basics you need, maybe with added books by Debbie Brown, who covers a range of cakes from start to finish.