RE: cushion or seat?
Paul , It is funny you bring this up. In the couple weeks I have been getting all my hunting gear into order for the up coming seasons. Because I work shows all over right now my time is very limited in the next month of so.
My seat has been changed , as I used to be the same as you and only sat on the flip up pad that came with my vest. After my back surgery things had to change and I did try one of the flip down leg seats and really found it about the same. The problem I do not like about them is the extra noise level one has with carrying these type of seats into the woods.
Last year I went to the local hardware store and found a rubber tube 16 in that one would use on a small trailer and started to use it. The air that you can blow into it can be adjusted to what ever weight you are and does this change the way you feel while maintaining time at a setup. I have fell a sleep at the tree sitting on this thing, and have never did that before when I was uncomferdable.
Just the other day, I made a camo round bag for this tube to fit inside and now the tube is camo and attaches to the back of my vest , and I can not feel it at all. No noise when you move with it in the woods and your Butt fits right in this thing and it levels to any little uneven spot you may sit at.
I believe this tube is better then the chairs...BT