TheCarConnection.com reports that the 2009 Cadillac STS offers a tight backseat. Fortunately, the front seats are quite comfortable.
In the front, reviews are generally fairly positive in regard to the 2009 Cadillac STS. Of the front row, Consumer Guide notes "good headroom and legroom," but adds "some testers feel hemmed-in by the wide center console and high windowsills." However, "the standard power tilt and telescopic steering wheel helps dial in a comfortable driving stance." Cars.com agrees: "the leather upholstery is both supportive and well-cushioned," with "plenty of range for different-sized drivers." The only exception comes from a Car and Driver reviewer, disappointed with the hard plastic at the edge of the STS’s center console, which “still bruised our knees after just a few hours of driving.”
The back row is another story; Consumer Guide calls it "disappointing for a car this large," and TheCarConnection.com’s editors note that legroom is surprisingly tight for a car that’s so generously proportioned otherwise. Don’t plan to carry full-frame adults back there on a regular basis.
Regarding storage space, Consumer Guide reports that inside the cabin, "small-item storage is limited to a smallish center console and less-than-generous glove box." Meanwhile, "trunk space is unexceptional for STS's exterior size...a small opening limits the size of items that can be loaded."
Build quality in the 2009 Cadillac STS isn't particularly grand. Consumer Guide says 2009 Cadillac STS "interior materials quality is good when compared to domestic-branded premium sedans but falls just shy of the standards set by German and Japanese rivals." Overall, Cars.com finds the Cadillac STS interior "comfortable and lined with respectable materials," but notes "execution leaves a lot to be desired," adding that "most of the flaws could have been fixed with a modest freshening, something on par with what the outside received."