I don't follow Hecate, but this book ended up in my possession at any rate, so I'm sure there was some reason for it. It's not great, but it's decent and plenty of use can be gained from it.
The author talks mainly of his own experience as a devotee of Hecate and how his witchcraft practice has evolved over the years to become what he writes about in this book. There's a good bibliography in the back of the book, so I'm guessing the material here is fairly authentic, but as I said, I don't follow Hecate and know little about the goddess, so I can't say for certain if that's true. It just seems to be from the perspective of an outsider.
The author does talk about using human remains in some spells and rituals, though he makes note to acquire these remains LEGALLY, not by digging up bodies or any such nonsense. He also makes mention that collecting graveyard dirt is not necessarily legal and where he mentions poison plants, they're marked as being toxic with an asterisk.
On the subject of plants, where toxic plants or rare plants are spoken of, the author gives reasonable substitutions. I appreciate that, because, although it's true I can go digging around to find an alternative myself, having that info right there makes things a lot neater and faster.
I personally appreciate that the author doesn't shy away from telling off the concepts of Wicca (3-fold Law, what you cast comes back to you amplified, etc). It's highly refreshing to see somebody fearlessly stand up to such silly concepts. He's correct, such "morality codes" were not present in ancient practices and were, largely, introduced to the public by Gerald Gardener in the 50's. He says don't go casting curses willy-nilly, which is a philosophy I hold myself, but don't be afraid to blast a mofo if they deserve it.
Those that already have a practice with Hecate probably won't need this book. Those interested in learning about the goddess or are going to be working with Her and are newer to it may benefit from it. As for me, this is just another pagan/witchcraft/occult book that will be part of my collection and probably won't get used for actual ritual or spells.