I think you will find my answer interesting.
I purchased one years ago and never mastered it, no matter how many times the inventor demonstrated to me or how many times I watched the videos. Finally gave up and packed it away.
Fast forward a couple of years, I'm sewing drunkard's path curves and realize that if I lift and hold my top piece up and use the right amount of tension on the fabrics, I can sew very accurate curves without pinning! Thought about the Curve Master foot, went back and watched the videos again, and realized that it's more about the technique than the foot. I was not using the Curve Master foot, I was using my basic, standard foot. So then I tried the technique on some orange peel blocks and it worked.