It depends on what you're looking for. The Working Tools tends to focus more on the esoteric, with a lot of personal interpretations of things by the authors. If you're a fan of the "authentic school" of Masonic research, with a lot of citing of source documents to back up the information put forth, you probably won't care for it. If you're looking to delve into the esoteric, "speculative" type of Masonic writing, you probably will.