I look it over good as I'm rolling it. I also use extra or add on a piece on the side if the back is not large enough so that I have room to test stitches with every bobbin change. I stitch then loosen the quilt enough to that I can turn the edge to see the back stitches. Usually if something is wrong I can feel or hear something different happening. Same with a panto, I'm looking at the panto not the quilt so I've gotten used to a change in the feel or sound to tell me something is not right.