I have had both Spax and Koni struts/shocks. I really liked the Spax. Externally adjustable from 1 - 15, I had them ste at 3 in front and 1 in rear. Nice comfortable ride, until you pushed, then they were like different shocks. The Koni's handled well but a real rough ride and had to remove them to adjust. The adjustment was 1 - 5. Spax was what all the Formula 1 teams used. Best I ever had!!
