This is a fascinating premise, but I think its effectiveness is conditional on a belief in the idea of past lives, the evolution of the soul over the course of several lives, and the concept that a soul chooses to work on learning specific lessons during each incarnation. If you don't believe this idea, then you need to be at least open to the idea.
Even without a belief in reincarnation, there are some interesting activities included that help you see yourself in various ways, including how you change to fit in with different groups, how others view you, and various aspects of yourself that over the years, you've given up for various reasons.
I have completed the radical forgiveness form, and it helped me see in a completely different light a "wrong" done to me over 45 years ago. Baggage I've been carrying for a long time, and the form helped me to finally let it go.