It's no coincidence that the 2008 Cadillac DTS is used as the base for limousines. The vast room available is unparalleled in American-made automobiles. Edmunds says, “the sheer volume of room in the cabin makes the DTS a fantastic long-distance highway cruiser.”
According to Car and Driver, the DTS is “big and roomy.” One of the few cars left that offers six-passenger seating, the DTS has “a front (split) bench seat that is available on the two lower trims,” Edmunds reports. The seats have “as much legroom in back as they do in front.” ConsumerGuide proclaims the car’s "standard bucket seats are all-day comfortable." Automedia observes, “Tons of front-seat space lets occupants stretch out. Comfortable seats are well cushioned with modest side bolstering. Support is pretty good, for both the back and thigh.” In the rear, Automedia adds, “backseat space is no less bountiful, but a hard seatback is less inviting for the center occupant.” Car and Driver dislikes the “unsupportive, couch-like bucket seats,” though.
Trunk room is capacious. “At nearly 19 cubic feet, the trunk has no problem accepting large suitcases or a foursome's golf bags,” Edmunds says. “The wide, easy-loading trunk holds plenty of luggage,” Automedia writes.
Though the DTS is “designed for a comfort-oriented driver,” as Car and Driver observes, the quality of materials isn’t quite top-drawer. Edmunds says, “Although generally good, the interior materials are not up to the high standards set by European or Japanese luxury marques.”
Noise and vibrations are damped well, though. Kelley Blue Book says "except for a tiny vibration at idle, the DTS is ultra-quiet." Car and Driver also compliments the 2008 Cadillac DTS for its "ample interior volume" and a particularly "quiet cabin."