Curiosity got me. Ran across a good deal on this and picked one up on an impulse, even though I'm perfectly happy with my Exped UL 7.
http://www.klymit.com/index.php/product ... frame.html
Arrived unexpectedly about an hour before we left for a 2 night beach camping trip. So I threw it in (wow, that was easy

).
Folks seem to either love these or hate them. I'm in between. After 1 night, my bottom line is that the Exped is at least 6-7 oz more comfortable to me, so I'm keeping that and not the Klymit (promised my wife I'd only keep 1

). But it wasn't bad. I'm a side sleeper and I had to make sure I was positioned just right every time I turned over, and then it was OK. For the seriously UL motivated I think it would be great. Personally I've been lightening up and I'd keep it and sacrifice some comfort over say a 2 lb pad, but not the 1 lb pad I have. Can't speak to the warmth, since it only got down to 53. It is remarkably small.
25: MB | 24: MB | 22: BI | 21: RH-DF | 18: MC-DF | 17: WI-SB-WC | 16: RH-CI-RH | 14: BI-MB | 13: RH | 12: MC-TH | 11: WC-HC-WC | 09: MC-RH | 05: MI-MB-RH | 02: MC-CH | 01: BI-RH | 79: RH