Lance,
I don't have too much "hands on" with Festool's air sanders, but have used them at Festool ww shows and as expected are smooth, quite and efficient. They are unique (as are most Festool tools) in that the hose combines dust extraction, air supply and exhaust. Fewer parts - lower wear/longer life and generally quieter (except for the compressor). Because (primarily) they require a fairly large compressor, they are better suited to large/and or industrial shops and those are the customers who have bought them - including BMW NJ.
Bob