I just love Saxon and have used it for about 14 years. My sixteen year old finished the Saxon Calculus book a few years ago and decided to take calculus at a local college last year. He didn't hit any new material until the very end of Calculus 2. I can't tell you how excited I was to hear that. I kept asking him if was learning anything new and he'd say, "Mom! I told you--Saxon covered two semesters of college calculus! Trust me!" I will be using this for the younger kids now for sure.
That's good to know because my daughter actually basically put herself through Saxon Calc. She asked me for a little help and it did take some thinking and reading (it's been 18 years) but it came back. She'll be taking calc this fall in college.
She finished high school in three years and decided she wanted to go to public school for a year primarily for something to do. My son went because he wanted to do the sports thing. Since we now live in a VERY small town, we decided to give it a try. It's worked out well so far but they both told me the same thing about school. The only class they learned anything in for a long time was Spanish, which we never covered.
What's funny about Saxon Math, is that I've heard teachers criticize it but professionals, like engineers, can't say enough good about it. I looked at the public school textbook that this school uses and it covers all kinds of stuff that you would rarely use. My son told me that he found Saxon much more practical and he does have the grades to prove it. He was at the top of his class in math for the whole year (and bored out of his mind, to boot).