I'm in the minority... I have a padded folding chair in my sewing room. I thought it would be comfy enough but it wasn't... So I put a thick chairpad on it and now I like it a lot better. My room is very small and cramped and I don't have the physical floor space for the wheelbase of a rolly chair.
I used to have one and it was a pain in my cramped corner so I had to let it go :(
You can also try a seat pad and one of those mesh ergonomic back support jobbers - you can pick one of those up at Walmart. It didn't stay on my chair and now my son uses it as a shield when he pretends to play sword fight and he won't give it up lol.