This book is phenomenal. I am currently on Step 13, working through it with my Tarot book club.
It has helped me get way more out of any card -- looking deeply at the image for the meaning rather than relying on memorized book meanings, understanding the way the cards in a reading act together, creating my own Tarot language, so much more. In short, it has made me a better Tarot reader.
I think if anyone commits to really working through the exercises in this book, they have a ton to gain. Very rich.