All the gadjets aare for advertisinf and marketing. Don't be sucked in! Cut as straight as you can, measure as accurately as possible(twice) sew a straight seam, cross fingers and hope! DON"T point out discrepancies, no one but the quilt police will notice and who cares about them???? The inportant people, the ones you love, will love your offerings for them if you have done your best and sewn many stitches of love into their quilt. It, and the love will last for as long as their memory lasts! For you is the joy of creation and play with colour shape and texture! Enjoy your life experiences, don't seat them! Have fun!!!