At first you have to hide the fact that at, age 53, you are using a coloring book! Nevertheless I have stuck with it through a number of pages and have found out that my retention and ability to recall through visualizing the diagrams increases many fold versus the read and think method. When I revisit the pages to study the topic it comes back much easier. The book seems to be a good balance between the written text/descriptions and the illustrations. It takes a fairly big time commitment and at times you ask yourself, "Is this the best use of my study time?". Well after a few days the accuracy of my retention answered that question with a huge YES. It is much more technical than how one might visualize as 'coloring book'. I really do enjoy it and am learning the topics.