Without diminishing the knowledge this man has, I don't believe there's anything in that book that you probably haven't read before, or that you can't find completely free somewhere on the Internet. However, for those who are fans of the character and work of Bobby Lee, $27 will not be a problem, because the book will certainly have a collector's character with everything that can still be obtained if you pay $149.
Anyway, when is the sale of those 3 bundles end? I'm planning to buy the silver bundle but still hesitating if I can save enough amount before the sale ends.
Don't be fooled by the discount price, it's just a marketing ploy to encourage the customer to buy something at a price that is super affordable compared to the actual price - if you wait a few months the price will probably be even better - each product is the most expensive at the beginning of the sale.