I love the "hoover" function on both my viking D1 and my Bernina 570. This raises the foot automatically just a bit when you stitch. I usually put it into stop in needle down position....so when I am turning a corner....I stop stitching, the needle goes down and the foot comes up so I can turn the quilt without having to manually raise the presser foot....also wonderful when appliqueing by machine as it makes it way easier to do those curves and angles. I also loved the knee riser on my old bernia without the hoover function to turn corners with.