Great points. I have only used the Alaska bags for doing a caribou and then the Argali bags for doing a black bear. The Argali bags are higher quality and would last much longer, but at a slight weight penalty (comparing equal amounts of bags). I weighted what I had on hand, which happened to be those two versions.
I'm actually heading this July to do 4 days in Prince William Sound fishing/hiking followed by 4-5 days of bear hunting... my bag is loaded with the Argali. I kind of bit off on his "lightweight" comment, maybe a little too far. I'm a weight snob and have my 5-7 day hunting backpack around 35 lbs with rifle included. I count micrograms...