I bought this to go over another sleeping bag in the winter as I feel the cold. But it's surprisingly warm on its own despite being lightweight and I slept in it a couple of nights last week. It has a nice feel. I wasn't sure about the short, diagonal zip but it's fine and just as easy to get in and out of as a regular one.
I love this, I haven't slept inside it, but on a cold night I put my sleeping bag into it and became lovely and warm. Because of the price I've ordered another one that I'm going to cut the feet out and make it into a sit bag for sitting around the ca,mpsite in the evening. Not warm enough to use in the UK to use as a sleeping bag, but to add another layer this item is perfect