Way over priced...... but
This pad is among the best that I have used or tested. It's stated weight is spot on. It is warm to the stated temp. rating. I just got back from a 3 night/4 day trip in the Gila. The first morning was 22f (lots of humidity; ice all over the inside and heavy frost on the outside of the tent). I was using my Marmot Pinnacle 15 and wearing a complete base layer (with socks and beanie). I was just beginning to become cooler lying there talking myself out of the bag that morning. (I would definitely go back to my BA Insulated Air core if it were to be any colder.) I have owned the BA Insulated Air Core, the BA ClearView, the BA REI Sand Mountain Insulated Air Pad (same as the BA Insulated AC but with only 6 cambers instead of 7.) As far as sleeping comfort, I fine the SynMat UL7 at least as comfortable as the BA pads... possibly a litte more comfortable. The UL7 is just not as warm as the BA insulated Air cores. If it weren't for the ridiculous expense of this pad I would hands down say buy this one..... but this is crazzzyy (say it like Nacho Libre would) to ask this much. At this price EXped should include turn-down service! Oh, forgot to talk about durability: My dog is pretty hard on anything in the tent. This pad made it through three days of him clawing at it.
Update : During late summer of 2012 on the CDT (many nights on it by this point), I lost the check flap of the valve on the inflate side. Exped replaced this mat with a new one. Thanks Exped!