We have used two for years. Very comfortable with significant lower back support.
I left them with the trailer and yesterday, on a picnic, we sat in our older chairs that are superficially the same as the Strongback and my latest task from my wife is to get the Strongback chairs home.
The only negative is their customer support. The screw came loose and was lost that attached the cup holder to the chair. I called Strongback and their response was that they do not supply parts for their chairs. That was several years ago. Maybe they are better now.
2016 Ram 2500 4x4 Laramie
Arctic Fox 25Y