Haven´t driven a PDCC-equipped 991 yet but I still believe that the Panamera and especially the Cayenne benefit much more from the system than those sportscar variants. Especially given the quality of your roads, or better what you´ve documented so far, I am not sure if it is worth the expense. The question is, apart from the technical aspect, if you like the feel of the system. Is there any chance of testing a car nearby for you?