I love this math curriculum, and more importantly, my 6 year old loves it. This being her first year of school where she's really been expected to sit still and write a lot of things down, we've had our struggles when it's come to certain subjects, but luckily math has not been one of them. When I sat down and made a plan for what our year was going to look like in first grade, I had initially planned on buying Math U See Alpha, but was swayed last minute instead by over a dozen homeschooling parents in our area who use Horizon Math. Math U See may be a fine program, I don't know because we haven't used it, but I can say for certain that I am glad we are using Horizon for our homeschool math curriculum. We'll continue to use Horizon until it no longer suits my daughter's math needs.