I haven't used Abeka with my kids yet, but I went to a private school that used Abeka from K-8. I think it prepares you very well for high school and college. I even minored in math in college. I always had an easy time with math, and I think it was because of Abeka. I have seen a lot of people say that there is too much drill work, and I honestly can't remember if that is true. I just figure they provide more problems to solve in case you need them.
My daughter will be doing Math K4 this year, and I am excited to use Abeka with her. I've looked into Saxon as well, and it looks pretty good. If we were to have a problem with Abeka, I would definitely consider using Saxon.