I started two years ago with several different brands of rulers. During one of my quilt classes, my seams were not matching up and that's when my instructor told me she believes it best to use one brand of rulers. She recommended Kaye England rulers. I went to her website and bought a set ofall her rulers. I put Invsagrip on the back of the ones I use the most so they don't slide. Now my seams usually match up just fine.