In reply to jasonC abroad:
I have one, but in standard length not short.
For me it wasn't as crisp-packet noisy as I'd feared, there is some noise when you move but it's OK. Like others I also use a thin closed cell foam mat underneath it to protect it and increase insulation. Last time I used it was in hideous conditions and the only spot vaguely out of fierce wind/rain and flat was a concrete plinth, so slept on cold concrete in about 5 degrees C. Needed that thin foam mat, but in a summer campsite could sleep on a thin groundsheet or direct on grass with it not needing a foam mat
Impressed by the tiny size and weight, I don't regret buying it. It's very light and small