I have the 6600. I don't meant backstitching with a deco stitch but I was told on the Janome email group (I think that's where) that the accufeed doesn't work well with stitches that go back. Like if a stitch goes forward to do part and then back and then forward again like so many of them do. So you've done all of those types of stitches with the accu feed food with no problems?