You want to hear something funny? I bought a CurveMaster foot years ago at a show, watched the quilter who invented it demonstrate how to use it over and over and over and over. Went home and watched the videos over and over and over and over. Could not master it, tossed it in a drawer and forgot about it. Fast forward several years, I was sewing some curves and suddenly realized I was (successfully!) using the technique she had demonstrated with my regular, standard, came-with-the-machine quarter-inch foot!