Despite what other reviewers apparently think, this is a book about techniques: applying watercolor techniques or oil techniques to acrylics, making use of gels, using metallics, painting transparently or opaquely, and so on. And as such, the book succeeds quite well. Quiller's style has nothing at all to do with the techniques themselves; he isn't saying "paint like me!" He is simply showing his own examples -- lots of great examples -- of the techniques he presents. If you want a book that tells you how to paint in a particular style, this isn't the book for you. But if you want a good source of techniques that can be applied to acrylics -- using your own style of painting -- this book delivers.
This book contains a good color wheel and some useful discussion about material, but that's about it. The art is extremely idiosyncratic, stylized, and modern, and it is not very appealing. What's more, it appears that the author only has command of one style/genre, and that won't be of much help people who are trying to learn. Spend your money on The North Light Book of Acrylic Painting Techniques instead.