I have had DTS's, Devilles and El Dorado's in my past and the ride of this car is smoooooth! The suspension is way smoother than the 07 DTS that I traded in. Also, the soundproofing on the XTS is unbelievable. It is so quiet inside the cabin. The quick ratio steering makes it a pleasure to drive.
Before you listen to anyone tell you otherwise about the XTS, go take a test drive. It convinced me and I was not sure that a V6 could perform like my old NorthStar.
It is plenty peppy!
The high tech stuff I am still figuring out. Not that its difficult, it just takes time. The iPad it came with has some great apps to learn from.