As I said, "google is not your friend on this one, or it's too easy."
Now, google is your friend and here is the answer: http://gtfour.supras.org.nz/superstrut.htm
Toyota Team Europe (TTE) used the superstrut on the Celica. It improved turn-in. It was later abandoned because of reliability issues. A friend of mine, who's an ex TTE mechanic, said that there were too many bearings in the system. Dust would get into those bearings too easily and damage them.