I've done about 5000 miles with a series of these pads. When they work, they work great! The R value is huge for the low weight, I used to always get cold on foam pads. The problem is that the valve keeps busting. My first pad went somewhere around mile 7 or 800 on the AT and was a gradual progression to blowing it up 6 times a night (a total of 2100ish miles on that pad). They didn't email me back for a month even though I mentioned I was a thru-hiker, and when I called a couple weeks in they said I had to mail the pad and was very rude honestly. Um, I'm thru hiking, I can't get off trail for a week or two to mail to you. Apparently this guy was not following the usual policy which is very hooking up thru hikers.On the PCT it again failed after about 8-900 miles and I called (do NOT email, I did that too and again it took a month), the rep was super nice this time and was able to arrange for a loaner to be sent in maybe 2 weeks, at which point I'd send mine in for repair. The loaner was not the same pad which was a huge drag, it weighed a lb more, and didn't fit inside my pack, but at least I had a pad. My pad was kaputz and they sent me a new pad, which failed rapidly (blowing up 6-8 times/night) about 250-300 miles in. Ugh. Not the way to do the Cascades and Sierras. Again after sending in my pad once my hike was over they just sent me a new one. 100 miles of desert hiking so far and it's been ok. To be honest if I had more $ I would consider something else, but there's not a ton of UL options (Big Agnes has a new pad out with similar specs but few reviews). I have heard from European hikers that the pads they buy, manufactured in Ireland instead, do not have this issue with the valve busting. Can't confirm this though.