Oh how I wish I'd read all this before doing the latest BOM. The pattern did say to press seams open for accuracy but did I listen - nope - I knew better and was taught to press to one side. Well the pattern maker knew what they were talking about - ended up with lots of bulk in some seams, areas that didn't want to lie flat and some spots were difficult to get good points because of the bulk. I'm going to try to press open on the next quilt.