I can do stitch in the ditch but very sloooowly. I put on my walking foot and the magnifying glass on my Bernina and carefully follow the seam line. I hate it when it gets out of the ditch so I very rarely use SITD anymore. I use the stitch on my Bernina that wiggles or curves from one side of the line to the other. Less stress and because it is wigglying back and forth, I just aim the needle sewing down the ditch and let it do it's thing.