Thanks, everyone, for the helpful replies.

I am 100% sold on adaptive drive.

On the wheels, the opinion here (and in other threads) seems to be that 20" wheels (vs. 19") may look better but they could adversely affect the ride and handling, and exactly how much is a function of driving conditions. Does that sound accurate?

Would it also be accurate to say that adaptive drive would help to some extent with the ride quality aspect? Or is that hoping for too much?