We are definitely a dealer. And I have installed nothing but air over the last ten years. Properly installed they never leak. And it's no more maintenance than checking the tires, checking the valves, checking the fuel......look over at the bottle and make sure it has pressure. If not, put the spare bottle in (I almost always sell my stuff with a spare bottle) and get the empty filled after the race. On our SS-type stuff (150-200 runs a year) a 10 oz co2 bottle lasts at least all year. Even longer with a 2 speed....

But you wouldn't go up to the staging lanes without checking tires/fuel, etc, why wouldn't you look over at the bottle?