The weight rating said 240 and they have a 2 year warranty.
I think it be fine with 200#. As far as the side to side it will roll over if you lean over but seated it’s fine. I like the rounded one piece legs that don’t sink in the mud but that does make it easier to roll. If you put the chair up against a tree or tucked in some brush it be plenty stable.
I walk a lot so weight is the number one priority and this thing is light.