I got a foldable seat maybe 5-6 years ago, and have been using it sporadically until this year.
I have a bad back, and sitting still is tough for me. I have carried that seat with me on every hunt this year, and it has been a great help.
I replaced the cheap strap with a gun sling, and I use a heavier duty strap to hold it all together on the move.
Like someone said above, I forget I have it on my shoulder sometimes.
I guess my advice would be this.... Get something close to what you want, and then modify it to suit your specific needs (if needed). It doesn't have to be pretty, it just has to be quiet and work when needed.