Oh, I meant in the sense that this book will not bring you obscure information or something really new if you have read more than some books from Stoics.

Also, I don't think there's such a thing as a "stoic blind adherent", as self criticism is a big part of it. Examples would be Cicero, highly regarded by later Stoics as an egocentric asshole, or the early cinics, that molded stoicism for the future by criticizing it.