I have 2 of them, plus one extra motor. I haven't used in quite awhile, but now have a job that I think only the 15-91 can handle - going through heavy strapping used for handles on a large tote bag. None of the new computerized machines, and definitely not the little FW, can do it - So 15-91 is the last hope. If it works, I'll post a photo of the completed bag.