I have had two sets of coilovers, I had the KTS coils from SPL on my s14. And now... I have the fortune auto 500 on my S13...
They ride incredibly smooth for being coilovers, easy to adjust, exceptional build quality, pretty color of green
I definitely recommend them, ride is comfortable enough and feels very solid and planted on the ground. As long as you put everything together properly, they are quiet too.