Most of my trail buds have tanks, I have a OBA with in between frame rail reserve tank. Guess who never have to worry about how full is air tank is.
And easy to have an air extension hose for other rigs.
But even if they have some issues refiling them, they still like them. Have to admit, they are nice, but I do not have refil location less than 60 miles away. And when at my fishing cabin, compressor can run nail gun w/o ever worring about low air tank. Only have to bring along an extension air hose. Cabin is like 150 miles from nearest town.