We have tried: The roller worked very well and we can use it even on materials that we cannot use an iron on. It is slightly shaped so that the seam tab does not press into the front side. Just place the roller on the stitched seam, press and "iron". Perfect for patchwork technique. We can also use it when creating edges or folds not only on fabric, but also on paper, so not only seamstresses will appreciate the tool. Fits any sewing machine.