I picked this up since it seemed like it might be neat, and at the very least I could mine it for ideas to use in different games that I run/make. I ended up with the "least" scenario. The book is not particularly fun to read. It's not bad, but it's not something I would read if I were not looking for ideas for imaginary monsters. The book does have the usual Borges conceit of intertwining the fantastical and the historical, which is kind of cool, but in this instance it is not functionally different from the usual Monster Manual strategy of taking something that exists in the real world or in a real world myth and using it as a template/inspiration for your new fantastical creation. Or to put it another way, what Borges was using as a delightful literary idea 50 years ago has become, through the vagaries of the nerd entertainment complex, a standard and slightly lazy method to churn out product. Anyway. I was not unhappy that I read the book, but I wouldn't recommend it to anyone who is not GMing or game designing.