We traded in our Porsche Cayenne for an R350 due to passenger limitation in the Porsche. The Mercedes offered a spacious interior with comfort and luxury as well as easy maneuverability. The engine can be sluggish to start but the ride is smooth once you get going. If you're tall, you may want to think twice as there is little clearance between my head and the interior roof of the car without moving the seat all the way down. The sun visor is also tricky to put down without having to move my head back. Difficult to get used to after having 2 suv's with more height and flexibility.
Panoramic sunroof. Sound system is good and easy to use. 3rd row seats fold down easily. Safety and comfort. More rugged than expected in the snow.
Very poor front sight lines despite the sensors. Controls are tricky with the push btn start as well as the "behind the wheel" shift key feature, which can easily downshift while driving at high speeds. Bluetooth activation should be standard. Navigation system tedious.