Looking for opinions, test results, experiences had when using a Wiggy's bag. Friends of mine all have them and say they would not have anything else. The articles on the website seem reasonable enough, and the fact that the military uses them makes me wonder also. I was looking to buy one of the 'sleep systems' that was made up of two bags. Carry both in extreme cold, or one of the other depending on how warm or cold it got. All of my pals are section hikers which is what I aspire to be (several gear purchases from now) so the bag does not have to be featherlight. They are heavier than most (also cheaper), and user comments I have read seem to indicate they keep their loft and stay warm when wet.