When she started college, she was making extra money for school tutoring other students in Calc...as a freshman. Her big rant was that the school's texts were incomprehensible; and she used the Saxon curriculum, and the skills it gave her, to make sense of the standard texts, and guide the upper classmen she tutored. She was called the Calculus Queen; and a large number of seniors graduated on time as a result of her instruction.
I stopped after the Adv Math book...other interests took me away from the persuit...I finally figured out how to do math at age 45; but daughter#1...a double-degree grad... magna engineer, cumma deck officer....is a STRONG advocate of Saxon's books..including Calc and Physics: she says they are the best.
A little empirical, anecdotal thumbs-up. for Saxon.
See, that's what I think. THere are two Saxon camps: some hate them, some adore them. Sounds like a great kid, well done.