It adjusts how sensitive the steering on the car is, but adjusting how much 'boost' the power steering gives you. I find my 95 lincoln town car gives too much power steering boost in all but the lowest setting. When it's set higher I get very little feedback from the road, and could easily oversteer when going around corners. It is however a good concept. I have an elderly aunt who could have used the extra boost had she been driving this car. Personally I would rather be able to dial it down even lower so more effort would be needed to steer the car, but I realize it's a choice that others may like.