I have used books from this same company to teach other math subjects at our school with no problems, but I do not like this one. Not one of the 3 suggested course schedules actually allows for completion of this book. It would take at least 3 semesters. That's probably because the first 6 chapters are simply a review of Algebra 1 and 2, and not what I would consider "advanced mathematics," since those are required for graduation by the average student.
The inclusion of this vast review seems even stranger when you consider that other mathematical ideas are assumed to be understood, even though they are not usually covered in the previous subjects or this book. For example, the introduction of trig functions is awkward and not straightforward at all. If I was not already familiar with trigonometry, I would not be able to understand much from this book, and I am the kind of person who often self-teaches from books.
In fact, the entire structure of the book is awkward. Explanations of terms and examples simply are not as clear and much drier than in the Algebra and Geometry books. I can only assume that the author was trying to make the book seem more adult/college like. However, even most older readers don't like dry reading.
There are also fewer resources for teachers. For example, only chapter tests are provided. There are no section quizzes or other such additional assessments.