they've been building campers for years, so i would think they have the engineering down for the top side, and i'm sure with the past few years of ice house building under their belt, the bottom side has been refined as well...
if you treat them like a $30k camper, and not like your uncles home made $100 flatbed trailer after ingesting an 18 pack, any of them should last a long time...
for anything commercially built, i would find the layout that works best for you and jump in... as witnessed by most on here, a liquored up ice fisherman can wreck a crow bar in one weekend... just don't be that guy with a nice piece...
good luck...
btw... i have a friend who has had one for bout 5 years... has used it summer and winter, and it has held up well...