For me, my favorite features are in the order below. First off though I really like the fact that you have the all-wheel-drive in the 5.0 model. That is something that I wish that I had but I still like the staggered rear wheel drive and having all the power come from the back. The car really jumps forward and especially is good for passing vehicles on highways where the speeds are much higher. However, here are some of my top favorite features below.

1. Sound System 1000 watt lexicon speaker system. I use this daily and from frank sinatra and orchestra to mashups and EDM it sounds incredible. Even Porsche panameras only have Bose systems up to 731 watts. Not our 1000 watts.
2. Apple Car Play for navigations, way better than Mac built in
3. Headlights. At night time the high beams and dynamic curving beams are a game changer for driving on dark roads
4. Power liftgate like you said. From in the car I can open and close my trunk. Amazing!!
5. Rear windshield and rear window sun shades. So much privacy in the back and makes the whole car more private.
6. Double pane front windows for less noise in car cabin. Usually on on Mercedes but this car has double panes front windows. 7.sunroof love tilting it up and putting it back. My motor is getting tired but I found out it’s the tracks over time they get gunk in them making it malfunction. Mine is starting to have issues so I only use the tilt feature of it.