Can somebody explain in simple terms what one of these ludicrously expensive random orbit car detailers can do that is different to any other random orbit sander/grinder. When I read the guff on various websites regarding the actual specs of the machines involved, there seems nothing on face value that distinguishes the two. So far I keep looking, but as I cannot find any specifics that prove one way or the other (I don't mean someone just saying something is good, I mean the actual technical specification of the item) I am kinda stuck. I'm not going to waste alot of money on an expensive one, and I'm not going to buy a cheap one incase it buggers up the car, so I end up doing neither