I've commented on this before. I bought the Big Agnes last year and used it on my summer tour. It was more comfortable than Thermarest. It's longer for about the same weight (full-length Big Agnes vs. 3/4 Thermarest.) The Big Agnes packs smaller than the Thermarest. My back problems sleeping on the ground were lessened with the Big Agnes.

The only drawback was having to blow it up every night. However, I timed myself and it took about 2 minutes, not 5, and that was exhaling easily into it, not blowing hard. I found it fairly meditative, rather than overly annoying.

I haven't used the Big Agnes on a really cold night, so can't comment on its insulating properties. I bought the insulated one for cold nights. I had a couple of mildly cold nights in the mountains last summer. I didn't notice that it was colder than my Thermarests.

The jury is still out on the durability. My Thermarests have never failed once, and the first one I bought is about 20 years old and has been slept on countless times. My Big Agnes has only made it through about 20 nights' sleep.