They ruined the ride quality, spring rates for me just did not suit the damping (the were meant to work with DCC) and i think they dropped the car 5mm too much and just ran out of side to side articulation and front to back when coming into corners
Anything other than a smooth road forget it, made the car twitchy and nervous and unpredictable, completely ruined the fluidity of the stock set up, the worst modification I have ever done to a car, you had to look out for manhole covers and bumps to avoid.