In reply to Euge:
Hi mate,
I trialled one over a weekend. Great bit of kit, but, if you are over 15 stone and broad shouldered, then not a good nights kip as they do not support your weight adequately enough, in my opinion of course. I found it really uncomfy and may as well have slept on the floor.
Best off buying a Thermarest Neoair, awesome bit of kit. I am 6ft 3, broad shouldered and I use the small which is perfect to just down below my knees, packs down very small, weighs nothing and a very good nights kip.
Hope this helps, Den