I press open, mostly because I don't use printed patterns and trying to figure out which way I need to press when joining blocks is too time consuming for me. Also, my machine doesn't like those bulky seams... FMQ goes much better and I don't have a problem stitching 1/4 away from seams with my walking foot because the blocks are flat. I am convinced that pressing seams to one side results in many UFO's and is unnecessary in this day and age with short machine stitches. Yes, it takes more time to match seams, but once you have your personal method down it becomes routine. I have tried many times, usually on quilts for charity and simple ones, to use the press to one side method and I have always been unhappy with the result. IMHO it's a fast but unsatisfactory method.