I bought Chris's revalved Koni's and at first I wasn't sure if I liked them. For the street, at the softest setting with the stock springs I found them too bouncy and way too hard at the hardest setting. (to be expected I guess) Then I set them one turn from firmest on the front and one turn from softest on the back and went racing. They completely changed the handleing of the car. Now I have no understeer except on the real tight slow corners. On the fast turns and eses the car has a slight oversteer feeling. I was shopping for bigger front tires but now I'm in no hurry. The shock's cured many of the complaints I had about the understeer and overall manners on the track. If your racing, without a doubt they're worth it. If it's for puttering down the street ... with stock springs .... I can't say because mine are not the off the shelf Koni's.
My Koni's have made a most definate improvement and I would imagine the off the shelf ones are excellent too.

Les