 "DONT BUY IT unless technology, innovation and the cool factor are more important than simplifying the use of your vehicle for intuitive and enjoyable driving performance. The learning curve is beyond insulting, and the most ordinary functions are way too complex and time-consuming.  That applies to navigation/choosing a destination (which has taken me as much as 40 miles out of my way), connecting to my iTunes music, controlling the interior temperature, even the ridiculously complex dashboard functions.  I drove Atlanta-Knoxville and back for Christmas and the audio on my navigation suddenly disappeared (phone call to dealer couldn't figure it out so I used Google maps). I never knew how fast I was going because overnight on the road the controls went from miles to kilometers, and the appropriate dashboard function would not convert while I was on the highway (which is when I realized it). My recent trip Atlanta-Philadelphia was even worse. Frustrations are endless--like who would think that three knobs virtually on top of each other to the left of steering wheel (cruise control, steering wheel adjustment, and turn signal) was a good idea? You're driving on a trip, cruise control at 70, the speed limit slows down, you reach for cruise control to bring it down and you hit the turn signal. Or vice versa. Remember you can't SEE these knobs as they are hidden by the steering wheel. Some things could SO easily have been simplified if that were Mercedes' emphasis rather than "how high-tech can we make it?" The hands-on tutorial at the dealership was like 1 marble in a bowl of 100 in terms of how much it covered--but you don't know that until you're out on the road on your own. This is a lovely car and has a very smooth ride, but it's like a computer lab on wheels, not what I'd hoped for in my first-ever luxury car. I traded it in after 4 months on a new Subaru Outback--I love it, and things which takes 8 steps in the GLC 300 can be done in 2 steps in the Subaru.