Sergers aren't designed for seaming... they are designed for finishing seams. I wouldn't use them for seaming on clothes or quilts, because the stitching doesn't hold up to it. If you seam with just a serger, and then test that seam by pulling the two pieces apart, you will see the stitches. Serging just doesn't hold the two pieces together tight enough to please me-- especially not for quilt piecing.