This is my second foot. I sent the purple one back because it didn't work, clattered, and I felt like it would break. I don't get skipped stitches when the foot is flat on the fabric, but, there is very little moving around room, some of which for me is necessary on FMQ. This is an improvement on the purple foot which didn't work at all, I think because it was too far off the fabric sandwich. As soon as I wedge even anything under the bar to raise the presser foot, even a tiny smidge, then I get skipped stitches. I have ordered a metal open toe slant shank darning foot from sewing machine 221. When you talk about the Sew Classic one, do you mean the little plastic one that would require removing the last thread guide? I'll give that try if the metal one doesn't work.