Just my two cents: Anything from Guidelines4Quilting is awesome! I have their prep tool to give me an accurate 1/4" scant seam and their guides to make the scant 1/4" seam. I bet the Grip Strips are wonderful. I use Invisigrip and am not crazy about it. It's on every ruler I own, but I'd be willing to take it off and use Grip Strips in a heart beat.