I think that they probably lasts much longer that ten years, but they had to pro-rate it to ten. Each shelter is going to be set up in a different climate creating a different life expectancy of the shelter.
I don't think that they are meant to be a living shelter, only meant as a temporary shelter or storage. would be great to use in haiti or japan where a quick shelter could be used very efficiently.
1997 Honda civic DX( all stock DD)
1972 Toyota FJ40(4" lift, FJ60 axles, FJ60 4speed with split case, 35's, Detroit locker rear, Lockright front, Marlin Highsteer, 105"WB, Saginaw with GM tilt column, soon to have: 30spline longfields, inners/outters, toybox.
1967 Porsche 912(100% stock)