Wow, a seam guide is great. I can concentrate on the stitches rather than the seam allowance. Curves are easier: I'm usually tugging the fabric to keep it on the 5/8" line, but it was easier to anticipate the upcoming curve with the large, visible seam guide. I'd been meaning to buy a magnetic guide, but no need with this cheap, DIY option. I wish I had been using it since day one.