I posted about that last winter when I did my last quilt, but I'm sure others have posted about it as well. Some quilting instructor had a youtube video and she explained that she didn't press her binding because you need just a little more on one side than the other because of the seam. So, I gave it a try. It went on beautifully. Why do an extra step if you don't have to. That said, if you are doing reversible binding, you still have to press it or it won't come out right.