I really like this book. It is logical and easy to follow and does not use the "you are holding your needles in the wrong way" mentality I usually find in books about design. It is for the new generation of knitters who want to start to design their own projects and as a beginner in this area myself, I was particularly pleased to find socks and hats as well as sweaters, so I can start with something easy and work towards the more difficult areas.
There is a lovely section about colour and finding inspiration, beautifully illustrated with photographs and reproduction of paintings.
There is also a lot of graph paper to practice on, which, if like me, you are fond of intarsia and fairisle, you will find useful. I have not used the proportional graph paper and was interested to see how much easier it is to transfer a design using this paper.
I have tried to design a sweater myself in the past, without much success with the sleeves, reading this book I can see why, for which I am really grateful and can't wait to try again.