1) That type of mattress with an R-value near 1 is rated to not go below 51°F (11°C). That means it would be an absolute misery to use on many camping trips. Think about uncontrollable shivering all through the night and how much you'd pay to end that experience. Then multiply that price by 2 (2 people) and then multiply by how ever many nights spent camping. Sleeping bags can't insulate underneath you (your weight flattens it and removes that part of its insulation) so you can't overcome it with even a thick, expensive sleeping bag. Several layers of blankets
might work though if placed between you and the mattress.
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2) If you look at the Amazon reviews, many didn't last a month, which is the exact opposite of what was asked for.
3) At 80"x60" it won't fit inside many 2-person tents. Now, the OP hasn't said his tent size, but it is an important thing to keep in mind.
4) I'm not sure if you've done much backpacking. Here is the description from one of the Exped reviews "At 9 pounds 14.7 ounces and 27.6 x 11.8 inches when packed, the MegaMat Duo is unapologetically huge". For comparison, my backpacking sleeping pad is 1.7 pounds and has a packed size of 4.5" inch diameter x 10". Of course, you'll have to double that to add in my wife's pad. But still both of our pads combined is still about a third the weight and way, way smaller. The Exped is certainly NOT for backpacking.