My CTS' handling has been exceptional. It glides down the highway and has gotten lots of "wows" on ride quality from friends who have been in it. The soundproofing and speaker system are very good. I like the style too - it sticks out in the crowd without being ostentatious. There are lots of BMWs and Mercedes where I live, but my Caddy looks better and gets more notice.
The very good turning radius - it makes U turns and tight angles a breeze.
Improve the city gas mileage, make the navigation system more intuitive - it is not easy to enter the destination you want to get to.