I love how comfortably I sleep - just as well as at home. No need to have a smooth spot, as it evens out the lumps. The synthetic insulation is critical - much warmer than other air mats without insulation. Having used both the Exped 7 (72" x 20" x 2.8" deep) and the Exped 9 (77.5" x 26" x 3.5" deep) I recommend the Exped 7 - it is just as comfortable, and much quicker to pump up. Well worth the minute or two it takes to pump it up for a great sleep.
Four Grand Canyon trips and many sea kayak trips later, the mattress has held up great. Had to send it back once to get a leak repaired that I could not find, and they fixed it at no charge.
The Exped Synmats and Downmats are widely recognized by experienced backpackers as the most comfortable mattresses on the market. After getting the Synmat 7, I got rid of my Big Agnes Insulated Air Core (for backpacking) and my Thermarest Luxury Camp mattress (for car camping)---the Exped does it all; no need for more than one mattress.
The Exped is the most comfortable camping mattress I've ever slept on. It's so thick you don't feel the ground at all. It's wide enough to keep your arms from falling off the sides. The material and construction appear very durable. It doesn't lose air. This mattress has a pump built into the mattress. You can inflate it either with your hands or with a foot. It takes about 50 pumps---a couple of minutes. Not exactly fun, but it works well and is worth the effort for a great night of sleep.
For summer camping you turn the mattress over and sleep on the uninsulated side.
This mattress easily deserves a 10!