Editors at TheCarConnection.com note that the interior of the 2009 Cadillac STS is soft and luxurious. On the outside, it's similar to the CTS sport sedan with its aggressiveness and verve.
According to Kelley Blue Book, if you like the "edgy styling of the CTS and XLR cars...you'll like the 2009 Cadillac STS." However, Kelley Blue Book also points out that this model's styling has been seen before on the CTS, and buyers of cars at this level tend to prefer "a more distinctive vehicle." Forbes Autos describes the car as "spiffy" and a "viable domestic alternative to import luxury sport sedans." Cars.com comments that Cadillac STS "elements are in proportion" but says that the side vents are becoming an automotive cliché. Edmunds finds the grille "particularly striking."
Inside, the 2009 Cadillac STS is well liked all around. Kelley Blue Book notes that "the usual color choices of black, tan or gray are offset by the occasional use of nice wood trim...a sprayed-on urethane 'skin' gives the dash and door panels a rich look mimicking real leather." Edmunds observes "luxury buyers should be pleased with this Cadillac's generally high-class ambience." The STS sports a simplified dash over years past, with a wide center stack of controls and a nice balance of leather, plastic, and wood. Kelley Blue Book warns that one might "worry how well this material will hold up over time."