I have the second pair you listed, and find them terribly uncomfortable to wear for more than a half an hour or so. I've tried stretching them on a medium-sized cardboard box but didn't notice much improvement. They make my head feel like it is being crushed, and give me a terrible headache rather quickly. They crush my ears into my skull too. The noise canceling and battery life on them are great, but if you considering purchasing these and have a slightly larger-than-average sized head, this is something you should consider.