I've run the versalite since 2008, and have spent close to a year of my life in it (I treeplanted for 4 summers with it, and have taken it on numerous camping/hunting trips) and I'd say its still virtually as warm as the day I bought it. Sure its lost the odd feather here and there, but its doing extremely well for being 9 years old. If it ever goes on me, Im getting another.