Meh. There was lots of useful info, but too much that included EO blends from DoTerra (a MLM company). This has actually happened twice now, since I've been researching essential oils. I purposely avoid books that endorse a specific brand, cuz CONFLICT OF INTEREST.
The author or publisher should have to disclose this in an obvious way. When I'm 1/3 through the book and a 'recipe' calls for an oil blend made by one company, I get a bit cranky. Grrr.