ok, I love mine makes them so much easier to make 1/2 square triangles. If you belong to a quilt guild, get them to either have members demonstrate items like this or ask a local quilt shop to come in and demonstrate. Or you could contact the local quilt shop and ask the owners about a notions/rulers/gadgets demonstration class. Where I worked, we used to do it all the time. Kind of surprised more don't take advantage of this opportunity.