I have a padded fairly comfortable chair. I got if from a customer who has an office filled with these kind of chairs for their employees who set at desks all day long.
This one was in a junk room because it was broken. the back rest was defective. I asked if I could have it. I removed the back rest and it is now a padded stool. It has pneumatic shock/height adjustment and rotates 360 degrees plus it has 5 legs for stability and carpet friendly rollers on each leg.
Very comfortable to work from.