To answer the question you speak of. The ride quality is AWESOME, and I think I have put more miles on my IS F lowered to know in all aspects. It is great on the highway, street, whatever. When you look at a suspension for your car it is ride quality, and handling, that is why you consider this type of upgrade. Well, no shit, I was just saying I put it hard into the corners and it responsed like I wanted to see. Not all spring companies can say that. I used TEIN springs on a couple of projects and they didn't respond like these Eibachs did in the corner. I seriously test a product because I drive my cars hard as they should be driven in my opponion. The TEIN springs I just used where in my 08 Altima Coupe Turbo and it was soft in the corners, not to impressive to say the least.I respect your opinion and input and appreciate your insight, but a couple things I would like to touch on. You stated that for the money the Eibach setup can't be beat but why would that be an issue for people spending $60,000 and up for a high end performance sports car? We are talking about ride quality here, not what tire shine product is the best for your 19 inch rollers. And your desire to have better cornering when altering suspension wreaks of "captain obvious". Isn't that why one would upgrade suspension, to improve cornering ability? I will not endorse Eibach and in my opinion hold KW, Tein, and Tokico as better options.