I have used Math.U.See from the beginning of my homeschool career 7 years ago. I was introduced to it from another homeschool mom.
This curriculum is very multi-sensory using write-it, say-it, see-it, and build-it to teach the concepts in order to understand. I love that Math.U.See incorporates word problems for use in the real world and it sure has helped me to relearn many problem-solving equations and formulas.
For instance, just the other day I had to measure how much fertilizer I needed for my lawn and because we were just learning the formula for area of a rectangle in math, I knew exactly how to figure it out.
My two sons do very well with Math.U.See. The video introduces the lesson, the teacher manual repeats the instruction on the video, plus there are 3 practice pages followed by 3 systematic review pages. Everything is reviewed and brought up to speed from previous lessons.
I give Math.U.See an "A" and highly recommend it.