I've owned two of these sheds for over 10 years. They still look like the day I installed them, with the exception of some minor rust on the metal door components.  Regardless of the amount of wind blown rain or snow, the interior stays dry and they are well ventilated. 

My only negative comment is that if you are installing it on a plywood sheathed wooden platform, the extra 6" requires buying a 4th sheet of plywood or finding a 4'x6" scrap piece at your lumber supplier.