I received my medium Mountain Hardwear Nitrous and its a perfect fit. I was very concerned about fit so I'm glad I went with this one. Weight without stuff sack is not bad at all at 9.9oz. I was outside at 25 degrees with only a t-shirt and the jacket, oh yeah and some pants. So far it seems plenary warm. The only minor thing I would change is the cuffs. They have elastic to make a seal but it doesn't quite seal on me. If I had gloves on it would be just fine. It also has only 1 zipper pocket but for me its not a big deal. I think this is going to be a very flexible piece of clothing.
