I SID quite often but do a better job without the specialized foot. Just use my walking foot. I occasionally go out of the ditch but only by a couple of stitches. I have learned to let it go and once the quilt is on the bed I don't notice it. We all make the mistake of examining our quilt up close when we should lay them out on a bed, even during piecing, because that's the way the quilt will be seen. If you are looking for perfection you will never be happy with what you do. Think of the small imperfections as what makes your quilt or any project unique and one of a kind.