The blind that I got came completely assembled, with only the support structure to assemble and attach. Then, following the Utube instructions, we stood it up. It was far easier than I had expected. I did all the assembly and attachment by myself. It was easy. Then I called my neighbor to help me stand it up with a tractor and some light chains.
The blind itself is two years old, I think (maybe 3). All windows seal with a good rubber gasket. Same for the door, but I see that the squirrels are gnawing away at the soft rubber door gasket. I don't think that'll get them into the blind.
In all the big rains we've had, only a small amount of water has dribbled inside. I probably need to put some silicone lube on the rubber.
It was expensive, but I'm thinking that I got my money's worth. And it really was easy to put together and stand up. You will need some good ground anchors, because the whole blind and structure are pretty light.