It's major for me and is more about the stance and feel of the car. When K-Tec fitted them they asked what I wanted and I said something that is best set up for Fast Road and everyday use. They lowered it about 20mm all round, they said. So it could still go lower. So far no issues with rubbage and has only hit the bump stops once. My wife feels that it is a more comfy and less harsh drive than the original set up which she hated.