I'll second what 71 said. Once I had them replaced, I loved driving the car. I guess it is one of those parts that just wears out faster than we wished. I have heard around that you can buy the replacement bushings but can't find where. Kind of the same thing with the upper control arms. No, Lexus does not sell the bushings, only the entire unit.
Every time I think about getting rid of this car, I drive it and spend what it takes to fix it. I only have 182,000 on it so it is good for years. Besides, I don't like car payments, nor do I need a new Malibu.