The Airmax slogan / buzzword was "Pneumatic Energy", and they had it right.
Many of us don't worry too much about leaking air ... because air is free, right?
Well, if you start thinking in terms of "pneumatic energy" you soon realize that you are converting electric power to compressed air.
The compressor itself has replacement and maintenance costs, and we all know the electricity to run the compressor isn't free either.
Airmax also has a great line of those safety couplers, FRL's, urethane coiled hoses, etc.
Lubricators for air tools is one thing, but having ANY oil or silicone or even water present in air that is used for painting is a very bad thing.
NEVER use an air hose that has been used with air tool lubricant, or you will have a mess of fish-eyes in your paint job.