After <50km of driving "hard" with the new ARB i found that the car is less prone to understeer, noticably, but now the rear feels "lighter" (I like it that way).
The ARB is not nearly noticable in the normal traffic/driving as the front strut but when driving hard the car feels and really is faster in the curves (the curve I could drive through with 90km/h I can do now the same thing with 95km/h and it feels like 90km/h).
I have to get my wheels aligned again and the suspension setup accordingly to the new ARB.
Well worth the money if you want to drive faster or with more grip/safer @ the same tempo like you did before.