I've had the Koni's on my truck for about 2 weeks now. Not a dramatic change from the Rancho's , but a definite improvement. The rear suspension actually works! There was no flexibility before. The front struts were a bit less of an improvement. But the harshness of small irregularities in the pavement is greatly reduced. Going down the road is much more relaxed. My driving is mostly county roads, and some highway. I do have the Z-71 suspension. I wonder what these Koni's would be like with the standard springs. I was just in time to take advantage of the sale price at Tire Rack. At that price, these should standard equipment on our trucks. Gotta love the orange!