Rating: 4 / 5
This mat has worked fine for me the few times I've used it. However, I basically sleep as if I'm a dead man - i.e. on my back with prit' near no movement that I'm aware of all night long - particularly if I'm exhausted after a long, hard day of trekking.
I find its hour glass shape easy to get situated on. Furthermore, the mat is very supportive and has a robust construction.
The hour glass shape allows the mat to be "cut-down" in both length and width, as well as the corners in order to reduce weight without affecting the self-inflating area of the pad. This I have done. However, since most of the "cutting" will be done from the slightly narrower foot end, the weight savings will not be quite as great as one might expect - though still worthwhile.
However, I can fully understand the position of the first poster to this Review Thread, and can "see" how its unique hourglass self-inflating shape could pose "fit" related problems for some torso sizes as well as for someone who tosses and turns throughout the night.
My only gripe is the placement of the inflation valve. It is right where someone might wish to place their head - especially if they have shortened the foot end (non-inflating portion) of the pad to reduce overall pad weight.
Even though I primarily do not use self-inflating mats, preferring the GossamerGear NightLight Torso pad, I feel that the clever design and robust construction warrants a 4 - at least for those users who find it a good "fit" both for their bodies and style of sleeping.