If you know what you are getting, I think this is a great product. This bag will not keep a normal person warm in 0 degree temperatures. I think maybe Bear Grylls could survive a night of subzero temperatures in this thing, but not your everyday guy like me. This was a good product for the price though. I am a 6'3" or 6'4" guy who weighs about 205 lbs and I was okay with this bag's warmth and size. It would be nice if the zipper was a two way zipper, but it is not and that is fine. This bag kept me warm and pretty comfortable on a trip with temperatures dropping to about 30 degrees. I could have been fine if it was a little bit colder, but not much. I was still layered up with huge wool socks, sweat pants and a couple shirts. The bag also packs down to a pretty small size which was very nice. All in all, this is a solid bag, not great, but you are getting a decent product for a great price.