I have it on my car. If you have the £££ get it. It makes the car go round corners like you car`nt believe!
It does make ride slightly stiffer, but just switch it off for a smoother ride.
My brother has my old ML, an `06 with Airmatic suspension and back to back the X5 rides as good as the ML in `comfort`, but walks away in the handling department. With the ML, you need to change the suspension settings before you go to attack mode, the X5 is there straight off, then if you really want to go for it hit `SPORT` button. With the sport setting on the ML, it just seems to make the ride very stiff, but with X5 in sport the ride is still quite complient and much more passenger friendly.
It really is an impressive car, but not miles ahead of the ML in any department. The ML has some nice features over the X5, but I would`nt swap.....