Excellent!
I used this sleeping pad after always using air mattresses. my sleep quality was much better, I couldn't feel the cold seeping into my hips and shoulders and was even able to sleep on my side without discomfort. It was easy to inflate and easy to deflate. I pre-inflated it at home before the trip to "wake it up" a bit. I'm very satisfied. I can't comment on long term durability, but hope it will last a long time. The only qualm I have is there is no stuff sack, but I guess it's better to store it flat.

Nice comfort
Good combination: light weight, small footprint using less pack space and a fair price from Altrec. Will be used to traverse the the Grand Canyon in multiple seasons. Friends spoke highly of Thermarest products and Altrec making the choice easy.

Great pad. Very lightweight and comfortable while keepin me toasty. I am a 6'2" M and fit well on the pad. It's easy to roll up for storage and attaches easily to my pack. As for the slipping off the pad or the pad itself slidin on the tent floor, I have not experienced either even when the tent isn't on perfectly flat ground.

comfy non-slip
I've been using the prolite plus for two weeks straight and air is still holding and the non-slip is great. Self-inflation is slow but a few puffs was all it took to make it firm. The air valve is cheap although good enough.

great warmth and comfort
I used this on a backpacking trip in Ohio in late October. At night, it was in the 30s. I slept in a hammock and had this under me. Usually I can feel the air under me in the hammock but this formed a nice barrier from the cold. On the ground it's comfortable and warm also. My buddies all complained of how cold it was and I was the only one who was warm all night. The sleeping bag I had and what I was wearing was nothing special or different from what they had. IMO it was this pad that made the difference. One of my friends bought one of these after our trip because of that night. The Prolite Plus is thicker than the Prolite however the Prolite packs much smaller. I got the Plus regular length because I have a big pack and would rather have the extra comfort. Also there's not much of a weight difference between the two. Blowing the matress up took all of one minute and the valve allows air to escape if the cap isn't screwed down. The under side of the matress has a gripping surface to keep from sliding out from under you. Overall, the construction seems solid. There was a time when I thought I would never sleep on one of these but I didn't realize how much more comfortable and warmer it is. I definitely recommend it. Only 4 stars for durability because I could see puncturing the matress but it would also be easy to repair. The seams look sturdy too. I think it's a little pricey but worth the comfort.