Ryan Malone wrote a review of Marmot Helium Sleeping Bag: 15 Degree Down on December 25, 2012
Familiarity: I've used it several times
I only gave this 4 stars because of pone big issue that kept haunting me every night of my first trip using this puppy. The zipper snags way too easily, and when all you want to do is get into a warm sleeping bag, it can be very tedious to zip up your bag.
That said... with that out of the way, I simply can not fault this bag one bit. It is comfortable, it is big, it has wide shoulders, and it stops cold wind from entering the sleeping bag.
If you are a warm sleeper, this bag may even be too hot for you!
The bag packs down smaller than any other bag that I have owned in the past, and weighs next to nothing too.
I am around 6 ft 2 in, have a lot of extra padding around the mid section, and I ended up purchasing the long bag, and that gives me plenty of room to wiggle around, plus extra room at the shoulders.
All in all, I don't think you can go wrong with this bag at all. Just mind the zipper!