Creative Grids is definitely my ruler of choice. Love them more than any other brand. Easy to read and marked well plus have the little anti slip dots built right into the ruler. I use my 6 1/2 x 24 1/2 more than any other ruler. Next comes my 12 1/2 square then I use my 6 1/2 square quite a bit as well for squaring up HST because I use the grid method of making HST and I make them a full inch bigger than my finished size and trim down. I find that makes the most accurate HST.