The book is well written and interesting. Most of the demonstrations are clear, easy to follow, and give a good grounding in the use of layer masks. However, unlike his earlier book, none of the QR codes or bitly links worked for me, so I was unable to download the images he used and work through the demonstrations with him. Near the end of the book he describes the production of a vignette effect using four blends, but gives no information other than that it is possible! I found that very irritating, though I have since worked out how to do it.