I have four 15-91's and I know I only need one or maybe two but I just can't seem to part with them. I have one that is in a cabinet that is set up at all times in my sewing room for my fmq work. I don't do a lot of FMQ because I don't care for the heavily quilted quilts but I do use FMQ on borders and inside blocks. I just dearly love the way the 15-91 works on FMQ and it is also great for other sewing but I usually use my 201 for putting on binding. This way I can keep the darning foot on the 15-91, and the walking foot on the 201. It is a perfect setup for me.