After completing the first Jacob's Ladder block for the Vintage quilt I pressed the seams opened and checked the size. I am totally shocked at how precise it is! Every single line and diagonal lines up and it doesn't need to be squared up at all.
Is that all because of pressing the seams open? Nested seams very likely would not be that perfect since the nature of nesting them offsets the pieces. (clicking on the picture shows a close-up)