It is a great benefit to everyone that Ken Cohen has created this great reference work containing many details of every aspect of Qi Gong theory and practice. Most other works are either patchy and incomplete, or in Chinese. Since Mr. Cohen speaks Chinese, and has taught and practiced Qi Gong for most of his life, he is ideally suited to providing this material. It's particularly helpful that he has also presented so much of the material as DVD instruction videos.
However, in many ways, this is a work for the Qi Gong teacher, or at least for committed students of many years. While the material can certainly be used by beginners, it requires more time, effort and money than those who only have a casual curiosity are willing to invest in something they have not experienced.
Each aspect of the learning process is dealt with in great detail, such that the student is never going to say "I'm still not sure what I am supposed to do at this point" (which is a comment I've read about many other qigong and yoga products). But the flip side is that the student needs to commit to investing a large amount of time to this course. For example, many exercises have 10 minutes of introductory explanation of the proper state of mind, prior to 10 minutes of explaining the exercise itself - for something that is going to comprise one or two minutes of your daily practice.
So, for the more casual beginner, which is probably going to be most people, there is a more simple and less costly solution. Get the inexpensive and excellent DVD set "Qigong Beginning Practice" by the Garripolis, which is probably the best instruction video for casual beginners, and then get Ken Cohen's paperback book "The Way of Qigong" which contains all his excellent knowledge and explanations of the theory and significance of Qigong. The cost of both together is less than a third of the cost of this course.