About the same as the K-Sports at their group buy price. From Demon Tweeks the Konis were £350 delivered. I've heard that the damping is better than K-Sports, and even Diyamas. I intend to fit Ground Control and camber bolts in the future.
I understood that a harder rear creates more oversteer, and as I suffer from slight understeer this should correct. Next move for handling is Nismo rear sway bar and, if I can in this country, get the rear beam bent.