We have a fully loaded GLS 450. My wife had a unexpected acceleration and the car drove through the garage wall into the house causing about $25,000 to both the vehicle and the house. She swears her foot was on the brake. MB says the "black box" disputes that assertion. The car clearly malfunctioned. The airbags did not deploy. The highly touted and heavily advertised accident avoidance system did not stop the car. MB customer support has been difficult to work with and actually seems to be trying to avoid us.
You have to be able to afford this much fun. Acceleration and braking are impressive. You also get all the interior space you should need. Gas mileage in city is around 11 to 15 mpg and on highway 16 to 19 mpg depending on traffic and weather conditions. Not too terrible for 577 hp. I have no complaints.
Driving this SUV last 1 month. So far pretty much impressed with the ride quality. Sometimes it does give shaky ride when its too windy but vehicle does great control for all drive conditions. Interior cabin noise is quite and did 2 hour journey, it was awesome drive. Infotainment system and Navigation is not so great. The buttons are clunky and too difficult to operate while driving. wish Mercedes thought better about this. Make sure you get the driver assistance package, lighting package. I missed both of them in my vehicle and should have got them. Apart from Infotainment and controls and i am satisfied with overall owning this vehicle. Accessing third row and space is great for 7 people and including 3row for adults. Getting in and out are easy too in third row and second row gets fold, so luggage and people have to get out to access third row. It is not as spacious as Minivan if you are looking for too much space in this SUV.
The following features are must to get best out of Mercedes. Driver Assistance Package Lighting Package
Improvements needed - No Music Track change option on steering wheel, have to rely on multi function button. No wireless charging pad or space for keeping phones. Need some space improvements.