Balloons suck for sleeping. I have tried 10 pads modern expensive. My Exped is the closest thing to comfort, but compared even to a stack of quilts it still sucks. I think back sleepers with smaller upper bodies do best on them. If your top half is significantly heavier than your bottom half, you end up bending over backwards if you try to sleep on your back, and that sucks. If you have a muscular butt it's even worse.
Closest I can get to comfort is side sleeping with pad about 2/3 full. Still, better than the ground.