I have it on my E70 and was determined to experiment with it, whilst I had some driving to do on some really bendy, hilly roads in the Scottish Highlands. I've never really been able to feel a whole lot of difference on many roads, but you certainly do on bendy hilly stuff. Most noteably the dampers get much stiffer, and the car is very firm on bends. It gives a firmer ride, as the suspension travel is shortened. Itseemed to make the E70 much more point and shoot, ie you come off a rise on a bend, and as you come down, it just grips immediately, and you take the direction of the road much more instantaneously, which kind of reminds me of my Audi S6 Quattro,.. but for a car as big as the E70, thats impressive

But unless you plan to do that sort of driving a lot, you could live without it, put it this way,.. to reap the benefits of it, if you had any passengers, they wouldnt thank you for driving like that in the first place All IMHO ofcourse