I have a Janome 7700 and a 1/4" walking foot. I do use it for piecing sometimes but where it shines, to me, is sewing on the binding. It feeds the fabric without shifting and keeps me on the 'straight and narrow' for my seams. That black guide takes a little getting used to for regular piecing but I hate changing feet so I usually just suffer through. The regular walking foot (accufeed as they are called on the 7700) is wonderful for straight line quilting and I would never use the 1/4" accufeed for that.