I have not looked at it closely, Melissa. With all the math curricula being produced, it’s difficult to give each a thorough investigation; and I would hate to give an opinion based on a less-than-thorough impression. So rather than critique each curriculum, we recently put our efforts into making available an in-depth look at how Charlotte taught math. That way anyone can read about what she did and compare the ins-and-outs of whichever math curriculum they are researching.
You can find a summary of Charlotte’s approach in our Subject-by-Subject blog series, the post on math. And the in-depth look at her math methods is contained in the book, Mathematics: An Instrument for Living Education. There is quite a hefty sample posted on that page that you can download for a preview. Hope this helps!