Well for me I was having a real hard time with stright 1/4 seams on both my Babylock and Elna. Then joing here and reading about the vintage machines I ran across one a 15-91 cheap and now I can stitch a stright consistant 1/4 in seam with it. My peiceing is getting better as I keep going. Feed dogs are closer together and my material feeds in stright as with my other ones it feeds in cockeyed and I have to keep a death grip on it. So I am happy with my 63 year old machine, and use my Babylock for embroidery and fancy stitching, and my elna is just a nice little backup machine