do you regret not using a pad?
I used only a custom torso length neo air that I made. I regret not having a longer one. Sleeping on the rough ground was pretty tough, especially towards the end of the race.
If I do it again, my goal will be to not hotel at all. I would take a longer neo air then. The savings of roughly 4 oz would be worth the weight penalty, since you would gain several extra miles per day by not hoteling it.