I took Macybaby's advice and am using a 15-91. Every machine has a learning curve. The 15-91 has a lot of speed and a beautiful stitch. It threads right to left not the usual left to right. A big advantage is that it has a good size bobbin. The 15-91 has a nob on the underneath front that drops the feed dogs. I keep them down because this is my FMQ machine now.