Iv got MPSS on 19"s and Eibach ARB's, and find the handling transformed. The ARB's alone are a brilliant upgrade, and if you are suffering from roll, then id go for a set of these first, and see if they will do what you require before going the CO route. On the hardest setting, they are too hard for the road, so iv got softest on the front, and mid way on the rear. Even with this set up, the car is so much flatter through corners.
Id still like a set of CO's as lets face it, our cars are not getting any younger, but the ARB's starved off the hunger, and at some point, when funds become available, il get a set of CO.