Having tried different F10/11 models with different suspension setups, I definitely wanted AD if going for the 5-series. Works so well and I find the active roll bar part is the key to the better ride and control of the car. You can run in the normal and comfort modes and still have a car that corners on rails.
As to residuals, it is the reason I opted to buy a nearly new ex BMW HQ 535i, with less than 6k miles and loaded with kit, but with a price tag of over 40% off current list. Options on it I just could not have justified, less money than a new 3-series F31 328i touring. But have that 'peachy' 3-litre petrol and AD rather than just VDC.