Basically the power, the rotation, oscillation (if any), and the ability overall to do anything to the paint itself. You have to remember all cars these days are not acrylic soft paints! They are all sprayed by robots with high quality paints for durability/longevity.
Something relative to that cost would be more a "product spreader" vs something that can correct/rejuvenate that paintwork for you. The
DAS6 and DAS6 Pro are the machines that give you the ability to correct and repair the paintwork removing the holograms, swirls/marring/spider web marks commonly found on cars.
So comes down how far you want to go and how perfect you want the car.