At a recent class at our LQS she suggested before we sew the seam that we match up the seams and sew 3 or 4 stitches over the seam.....then check to see what you think....sometimes there is an easement to take into account, and she says make sure that side with the easement is on the bottom when you sew the seam. (The feed dogs help take in the extra fabric). If, when you sew the few stitches and see it isn't exactly as you want, then you only have a few stitches to remove rather than the entire seam. I do it now all the time....takes a little extra effort, but turns out perfect matching seams. Did I explain that so you could understand it????