I have used Horizons math for the past four years. My daughter loves it. My husband and I considered using a different curriculum this year and my daughter was adament that we use Horizons. The 4th grade workbook seems more colorful and seems to have more "fun" activities to apply the concepts they have learned. In the past, we seemed to get a bit bogged down with review, but this year it seems so much better. My daughter couldn't wait for the new school year so she could see what she was going to learn in her Horizons math book. She loves math and I think it is partly because of this curriculum.
Horizons math for K-6th grade has been the best math program I have ever worked with. Th way each lesson reviews past concepts and then introduces new material is an effective learning method! Love it!
If your child likes math, you will love this curriculum. Very colorful and engaging. It does move fast so be prepared to spend some time on extra practice if needed. Very thorough, too. We used Horizons for a few years then used Saxon for 3rd grade. What a mistake. We're definitely going back to Horizons.