Problems included a penchant for picking up dirt and fingerprints (the price you pay for a beautiful glossy face, we suppose), a cramped nav key layout with the tricky touch-sensitive Navi Wheel front and center, audio performance that wasn't bad but was expected to be far better in light of the dedicated DSP, and a "shovel"-like feel in the hand, a symptom of the phone's generous dimensions.
Run on an eight-inch screen with a similar screen faceplate behind the steering wheel, the Cadillac User Experience allows touch-based feedback (see the demo in the video above), vibration-oriented lane departure warning and (finally) a recognition program that responds to normal spoken requests for directions or music.
The main control surface is wide enough, in fact, that we could comfortably put three fingers on the top of the mouse, using the middle to control the mouse wheel and DPI sensitivity adjustment rocker (a nice touch in and of itself) without ever moving our index and ring finger from the all-important trigger buttons.