Just to add my experience to this, I'm running Bilstein b14's on the zed and even at the lowest settings they are beautifully smooth. I had a play with Jon's Teins, as bought from ZMANAlex and was blown away by the quality of these bits of kit. And run FK's which were (Sh!t3) on a previous car and swapped them out to bilsteins.
I think its another case and point of .... you get what you pay for