Trusting you quarter inch foot can sometimes result in problems putting your blocks together. I am currently making a Double Wedding Ring (John Flynn's version) using his templates to do 18" blocks. I had my 1/4" foot and even nudged my needle to the right. Pieced my first 6 strips and when I cut them into pieces to do the arcs I came up just a smidge shy of what I should have had. Of my melon was already cut by the template..there is no changing that size. So I called the company and they sent me John Flynn's business card which has "his" 1//4" seam. End of problem. I ended up nudging over my needle 2 more times to the right to match up to his card example..so it does matter a great deal depending on what you are sewing.