I also have one of these I picked up 15 years ago for $50.
I’ve used it while camping. Let’s you have back support on bench seats. However does take a min to rigg it up, and to adjust the straps till your comfortable. I could never figure how to get out of it without messing up the straps. So it’s not like you can stand up put it back on.
I didn’t have any pain or strain sitting with this.
