I bought the Insulmat pad this past spring at an REI closeout sale for something like $29. I've used it only for camping thus far, but it has proven to be MUCH more comfy than my old T-Rest ultralight 3/4 pad. Mine is the full length pad (72"??) and I wish I had purchased the 3/4 length. I'm 5'7" and it's really too long for me (sleep on my side, too). I inflate it pretty much to it's fullest and then deflate it until I reach the level I like, after I lay down.
It packs pretty small in it's pouch and doesn't take up much room in the pack. My only problem right now is that I have always used the old 3/4 length t-rest as a rounded "frame" in my frameless Rodney pack, so I will have to buy a very cheap and thin closed cell pad to frame my pack. I can use it as a sit pad, too. I haven't tried my Insulmax pad over cold ground or snow, yet. I may have to pad it for that. I really love the added comfort over the t-rest, though.

Cliff

http://www.trailspace.com/gear/pacific-outdoor-equipment/insulmat-max-thermo/