There has been a discussion on another group about the binding att for machines. One of the problems listed is that it doesn't do a real double binding, if folds in both sides, but the edge part is not doubled. So the thinnest part of your binding is at the edge, don't know if this would be noted by a judge, but as a practical application it would make the edge wear out quicker. Not a big deal if your quilts on being used on the bed.