Rating one 'system' vs another is tricky. The Blizzard Bag and it's mates are primarily an emergency system with acceptable performance in a very compact unit. If I am a mountain rescue tech racing to a avalanche that injured 12 people obviously 12 Bags in my rucksack have greater potential value than one or two vacuume packed sleeping bags. Or if I am a day hiker with limited kit but unlimited foresight a unit in my daysack is good insurance. Emergency service users will use such a unit once and discard. A civilian can use this in emergencies or simple preference and expect a usefull lifespan. I have deployed mine every afternoon, taken a cat nap and repacked it. I don't know as of yet a reasonable service life vs a poncho, bivi bag etc. If you have a dedicated lightwieght setup stick with it. If you foresee any scenario where a easily packed unit could be handy consider Blizard bags. Performance is vastly improved over a placebo space blanket.