Stiff in the back, try using the front spring in the rear and only then will you know what stiff really feels in the Kia. I enjoyed the extra stability from the stiffness, but the faminy complained and had to go back to my Mazda MPV springs. As Dave said, the progression of the springs is a real treat and the best thing is, drop, they give a lot of down travel, something I didn't get with the Eibacks, the front springs in back, or the stock springs, and as Dave, I have never bottomed out even when fully compressed, oh, by the way, am I supposed to have bump stops in back, cause I don't see any.