 This is my 6th Mercedes and 4th E class.  The 2017 E300 is nothing like my previous E's.  I have had electrical problems, brake problems, keyless go issues and the command center freezes up.  When the command center freezes, all features of the car are inoperable-the nav, phone, radio, etc.  The dealership has had the car multiple times and can not seem to get everything repaired.  The command center just went blank today on the way to the office today.  Also, be prepared to hear squeaks and buzzes from the dash and doors.  The dealership has been able to remedy SOME of them.  Please don't make the same mistake I did and get 'wowed' by the 'technology'.  The controls are difficult to figure out and require multiple actions for simple adjustments.  Lastly, the four cylinder is not appropriate for a car of this caliber.  Drive it for a long time before deciding.