Our Eagle is nearly 5 years old, so things may have changed slide-wise. But our two slides have given us no problems at all, seals the same, and we lived in it for several winters.
I've heard that walls are 2" thick on forums, better than sales talk, but no knowledge beyond that.
Good luck with yours.
'11 Eagle 320RLDS
'02 F350 PSD Dually 4WD
DW's Ride, '13 Expedition