Using CO2 to operate air lockers

Anyone out there using a Powertank or other CO2 system to operate their lockers? Seems like an easier way to do this as well as being quieter.
Pros/Cons anyone?

I know a guy that does it. It works fine. Biggest con is always making sure your tank has enough air. He carries a spare. With carrying two air tanks, I think it would be easier to just get the small arb compressor. It is very small and mine only runs for a sec when I engage the rear locker then it doesn't run at all.