I've realized that a 0 degree bag means that you'll survive a 0 degree night, but it might not be super comfortable if you're a cold sleeper. Spent a wicked cold night on Pfiefferhorn (definitely single digits) and was a bit chilly overall, was fine once I put socks and my fleece on. The other 5 nights when the temps were in the teens I was toasty warm though. I'll be in the market for a nice fluffy down -20 bag to replace this.
Pros: Price! This thing holds a ton of gear for its size and the front access panel is a brilliant addition. Hydration access is great. I've had mine for about 6 years and only upgraded recently to the MH BMG because I needed a huge alpine bag for an extended trip requiring tons of group medical gear. Simple to adjust size.
Cons: Waterbottle pockets barely fit a nalgene, hipbelt is not super comfortable with >40 pounds in it, front organizing pocket isn't super useful, not a ton of lashing options.
Overall: 4 stars because it's a great value pack for people looking to get into backpacking, but lacking some of the creature comforts that I'd like.
Pros: Just as advertised it has a huge hauling capacity with lots of external lashing options for strapping on more group gear to your pack. The frame-sheet and suspension make extremely stable under heavy loads and the durability was not a question (unlike several Osprey packs that shredded on sandstone and ice on their maiden voyages). Surprisingly able to pack down into a relatively functional daypack when stripped of its hood.Ice axe retainers work as advertised and also opened several bottles of beer when I couldn't find my keys. If there really is a way to be super comfortable carrying 80 pounds of gear/food/water let me know.
Cons: Under heavy loads (60+ lbs) with less clothing (shorts and a t-shirt) it can shred some skin from your hips...no complaints in alpine environments. Ice axe retainer popped off with the first use, but was easily repaired with an overhand knot and has been used without incident since.
Overall: 4 stars because of my bloody hips and being able to carry more gear meant that I carried more group gear.