I really like this bag. It's lightweight and compacts nicely, comes with its own compression sack. Zipper is great, doesn't get stuck like other lightweight bags that I've had.
My only complaint is that it is a little tight in the shoulders, although I'm not a small guy either. With the heat vents unzipped its fine, but with it all zipped up its a little small for me. I also sleep hot, so I like the heat vent option.
All in all I like it and would recommend it for backcountry and all but the coldest weather camping.