They are as good as you can expect for around $900 for the set. If you want real quality look at JIC or Tien coil overs. The K sports have some issues with the valve settings, one shocks lightest setting may be stiff as the strongest setting on another shock. But you can adjust spring pre-load, adjust the body height, etc. Some cars have issues with noise while turning and shocks can blow out, but they are replaceable.
~John