Well, I've been looking at getting this for a while to replace a couple older bags with holes in them (and one with suspected chiggers).
It is on sale at midway now and I had to have it.
This thing is awesome. It has two different bags, a light and intermediate and then you can button the two together to make a heavy bag. It also has a water proof cover deal that is camo and buttons on to the outside of the bags and comes with a sweet compression sack. I'll be taking it out here next week to test it out whilst archery elk hunting. I am going to assume that I will never get cold. -30 is sufficiently chilly and I doubt I will ever have a wild hair to test out that rating. The two bags with the cover on take up quite a bit of room though and it doesn't roll up very small. Slightly larger than the standard intermediate green gi bags. I should have bought two.