In regards to the CTS interior, it looks good - not great - but the fit and finish isnt there. I bought an 08' CTS (fully loaded DI) in January 2008, and didnt even keep the car for 2 years (I had planned 3-4 years). As much as they (both GM and the dealer) tried to get things to not sqeak and rattle, it just wasnt going to happen. Combine that with some faulty electronics, and brakes that squealed so loudly people would stare at me at stoplights, and you get a car that just doesnt quite cut it. And once I added a JL W6, the interior was finished. Every time I turned up the bass, rattles started getting so loud they began to drown out the music. Eventually, I was so jaded with the Caddy and GM that I decided to switch to something else.
Needless to say, I am *much* happier with my new E92 M3 - light years ahead in the quality department. Not to mention styling/performance/handling...
Thats my .02