I know air impacts are unbeatable and with proper lubrication air tools can last long time. But what about performance? Are the grinders, drills stronger than electric powered tools?
I have a Sioux Disc Sander and 2 Sioux Die Grinders. Hands down more powerful that the Eagle, Kawasaki and Craftsman air tools I have. I do have a 1/2" electric impact that is one mean tool compared to the Chicago Pneumatic Air impact I have. Air tools will require a lot of oil if used a lot and you're compressor is running a lot. Compressors like to pump out moisture which the tools don't like. I have auto oilers on some.
You gotta remember that the main advantage to air tools is being able to stall them without burning up the motor (such as stalling an electric drill) or being too aggressive while grinding with an electric grinder.
Cost wise the air tool is almost always more expensive to operate; running a 5hp compressor vs a 6 amp electric drill