I don't know how I sewed without my walking foot! The Bernina walking foot comes with 3 soles -- standard foot, open toe foot and stitch-in-the-ditch foot. The SITD sole works really well! Pushes the seam open just right so the stitch is buried in the right spot. Plus it feeds the layers evenly, which the #10 foot can't do. They cost about $160 to $180, but they are worth every cent.