The points about the frame really are valid. They don't just do a better job of welding, they do a better job of designing and reinforcing.
I ordered mine with a hitch on the back for a bike rack. I'm amazed how this thing is attached - must add 100#!
I believe you could lift the entire trailer by it. Then there's the gusseting where the springs mount.
The only thing I dont like is that they weld the propane tank base on so it can't be repositioned slightly (it's in the way of my snap up brackets) and they weld the stab jacks on. The latter beig something one may have to replace eventually and because they're welded, it will be a pain.
I do have one other defect; a couple or ripples in the bathroom floor vinyl. (I may fix that myself)