I had nitrogen and the only way I would ever think about going back to it is if i could find someone to refill the bottles while they're in the bed. Swappin' out bottles is more of a pain than they're worth IMO. If you want to play alot an engine driven and 12 gallon tank(if you can swing it 2 12 gollons) will pay for them selves over the cost of nitrogen. Besides, unless you paint the bottles to match your truck or have a cover made for them, they look like shit. The only real advantage nitrogen has is there is no wait time to air up, and it's faster.