This large sedan has a beautifully executed interior, perfect for limo duty. The XTS is roomy, luxurious, and quiet inside, with comfortable seats. But the ride feels too ordinary for a luxury car, and handling isn't sporty. The powertrain lacks the finesse and brawn of some German and Asian competitors. The 3.6-liter V6 sounds coarse when prodded, though it ultimately performs well and returns a respectable 22 mpg overall. The unintuitive Cue infotainment system is frustrating to use, and the high rear deck impedes the view aft. We disliked the blind-spot warning system, which vibrates the driver's seat. A V-Sport version with a twin-turbo 3.6-liter engine gives the XTS V8-like power.