I liked the book. It's a novel, yet serious in-depth approach to the composition of your own spells, rituals, ceremonies, and rites. It won't be a sloppy treatment of the subject; that's for sure.
If you're interested in improving your spell-writing style beyond just grabbing a random piece of paper, quickly jotting down a few awkward lines, and hoping it works, this book is for you. It delves into this kind of writing as an actual art form in which you focus on, not just the intent, but on the craft of the writing to cause things to happen...and every bit of focus and meaning helps. If you haven't known anything about creative writing before, or you've never tried your hand at poetry and prose, you might walk away with an appreciation on the background of how to execute a piece that not only would work on an aesthetic level, but would also function practically as well.
The book treats the writing of spells as seriously as writing good lines of poetry, period...an approach that should be given a chance. Yes, it does discuss the breakdown of the theory of how poetry and prose is written, and the explanations might seem too technical and tedious, but a decent understanding on how to take apart and put together good writing could make a difference between mediocre ritual and something that might blow the socks off the god or goddess you're trying to get the attention of, let alone the audience who will be witnessing or participating in ritual with you.
If you care much about your rituals, give the book a read...but come prepared with lots of time on your hands, a comfortable chair, and a nice pot of tea by your side. It will take a while to discover how a master writes great magic.