I have Thermarest Base Camp pads dating back to the early 1980s that are still going strong. I still like them but they are a bit bulky and take some time and effort to fully deflate.
I have used the non-self-inflating pads from Exped when I need something that will pack down smaller and lighter than a Thermarest. But I have now had the internal baffles blow out on two Exped pads. The most recent blow-out occurred on a multi-day downriver trip when four baffles blew out over the course of about 10 minutes making the pad impossible to sleep on. I had no recourse but to deflate the pad and sleep on it on the tent floor.
That pad was a Synmat UL. It was purchased years ago when Exped baffle blow-outs were notoriously common. Exped has replaced it and has assured me, or tried to, that this problem has been solved. The other Exped pad was a rectangular Downmat 7 with separate inflation and deflation valves. That one also was quite a few years old but had been used very lightly when it blew out. I really liked that pad and Exped did replace it, but with a mummy style pad that was severely cut and with only a single inflate/deflate valve. I hate that pad and will probably never use it. If anyone reading this has had a relatively recently purchased Exped pad blow out, please report it.
As for puncture proof self-inflating mats, I finally broke down and ordered a Paco Pad, made by Jacks Plastic Welding. These are like Thermarest pads with a tough, Hypalon skin. Rafters on the Colorado River have been using these for decades and throw them right down on the rocks. If they get wet they can be wiped off and dry much more quickly than a Thermarest pad. They are certainly not the lightest and don't have a small packed size but are not outrageous for canoe camping.
Has anyone used a Paco Pad for river tripping? I wonder about their R-value which is not reported by Jacks Plastic Welding.