I prefer bias cut binding and have been cutting my own for years. There are exceptions though. If the binding is a solid I don't have a problem with the bias but if I am using a printed fabric from within my quilt I will use straight pieces only because of the waste I find cutting the bias strips. I don't like stitching together smaller pieces or the way the smaller pieces look as a binding. I find that I have such a large piece cut on the bias that to use the left over pieces I just have a lot of waste to cut back onto the grain. I don't mind this so much on the less expensive solids I use.