I love my 2005 Cadillac CTS. I wish that I had purchased the STS, or Deville, though. The CTS is too small inside for what i'm used to. Having said that, I enjoy driving my CTS every day 60 miles each way to work. I never have any problems getting around traffic with my CTS.
The Onstar system is great. I often use my CTS on long drives with my son to the doctor. If i were to break down on the road, I would be in terrible shape with my son not being able to walk. Onstar means I am NEVER alone, in the event of a breakdown.
Make a better looking interior. I feel like i am in a Volkswagen Beetle when I am inside my car! It is not until I get out that I am reminded that I am driving a Cadillac!