I am 16 and have been eying the Cadillac brand ever since my dad bought his Escalade. I noticed the CTS and instantly fell in love. I found an '06 luxary model with a little over 70,000 miles on it and bought it. There are absolutely no problems with the car and I look forward to driving it every time I get in it. It's got some great pickup, especially with the sport button and it drives very well in the snow. I have no regrets of buying this car and would recommend it to anyone I talk to.
I love the sport feature, heated seats/mirrors, dual climate control, 6-CD Changer, the pickup, and the overall style and feel of the car. Truly luxurious.
Considering I own an 06, many improvements have already been made. Because of it's age, I have no suggestions.