I would have just as much trouble getting a perfect half inch seam as quarter inch so the problem is being consistent. As long as you have to keep it the same all the time, how does it matter if you are sewing a quarter, half or inch seam? Once you learn to make a seam consistently the same, I don't get why it matters what size the seam is. Of course I do understand about when you have the set foot, as in the quarter inch foot. But anyone who can sew a straight and consistent seam of any size without one, is way ahead of me. LOL