I enter pur guild quilt show almost every year. We get a juddge from National Quilt Association. The judge is always picky about bindings. I went to help at judging this year. She said she could tell that we have been told before about our bindings. The corners where you miter needs to be 90 degrees, a nice square corner. Even tough I have heard that straiht of grain binding is ok if you don't have curves it wasn't ok with this judge. She wanted bias binding. The corners should have a stitch in the to hold the little flap shut on the front and back. She checked ever quilt for that. Another thing she didn't want the back to have one seam down the middle. She said it is too much stress on the seam. Make two xams if you back isn't one piece. I learned a lot by going to judging.