The springs support the weight of the vehicle, and the dampers control the springs movement and reaction to the forces put on them.
So, I made some enquiries about the impacts of a change of damper, and I was told the following:
Those dampers (I asked about B8 which are a shorter version of B6) offer 30% more damping than standard, so they will reduce body roll. The will not necessarily improve comfort on bumpy roads as the springs will react slower. Being gas dampers they will not be prone to fade.