I've owned several MB's SUV's, including the larger GLS (which I strongly do not recommend because of dangerous hydroplaning). The GLE is a very nice mid size SUV. Handling is excellent. Ride comfort...excellent. Visibility....excellent. Lane assist....excellent. Cargo space....excellent. Fuel economy....not bad for it's size. Build quality.....excellent. Very solid and safe feeling on the road. So many great features. Mine is pretty much loaded. The MB dealership in N. Olmsted, Oh owned by Bernie Marino is top notch. So then why not 5 stars? The nav system voice control is virtually worthless. I would never pay for it again. With the new ones I believe you can get Apple/Android controlled nav. I strongly recommend that option. Also, the collision safety feature that warns you if you are too close is totally worthless. It will occasionally bleep out of nowhere for no reason. Finally, when driving long distance after a couple hours the dashboard will tell you "it's time to take a break"......huh???? So you "ok" on the steering wheel control and goes away, then comes back every few minutes. Lol Just annoying. Anyway, no show stoppers here and so many great features. A very well built (and expensive) SUV. If you're willing to shell out the dough this is a great choice.
The GLE300d is a great buy for long commuters and as a travel vehicle for families. Short daily commutes are not quite as enjoyable considering the 4 cylinder engine is not as responsive as the 6 cylinder diesel in its predecessor. There is ample torque so it is very responsive for an SUV. The navigation and infotainment system contains a lot of tools and the apps are great: there are opportunities for Mercedes to improve on it though e.g. split screen like BMW does to allow apps to run side by side with the navigation. The finishes on the vehicle are amazing as expected of a real Mercedes.
There are very few "bad" cars in this segment. After looking at this, a Range Rover Sport, Q7, Cayenne, X5, XC90, and even a Land Cruiser (which I still want) - the dealership mainly won me over by not playing games and making it an easy purchase. The 400 goes about its business without much fuss. It's very quick - but doesn't attempt to be a sports car. There is more than adequate power/torque on tap, though the transmission isn't always as refined as I would expect in a vehicle in this class. I hate that the start/stop function defaults to "On" every time you start the car or change driving modes. The leather seats are extremely comfortable, particularly with the cooled seats option in Florida. Cabin is bright and airy with the panoramic roof (even closed whether you like it or not). Cabin looks somewhat dated but the quality is at least on par with the best of its segment, particularly with the real leather and stitched dash (I believe it was standard on my car but is optional on the 350). The infotainment is okay, crisp graphics but I usually leave it alone when driving. Mine actually has Magic Vision Control, which is far less interesting than it actually sounds (and likely makes replacing windshield wipers cost a small fortune). The adaptive cruise control is definitely my favorite feature for my commute. Steering assist is nice sometimes but feels strange when you want to take over - it will let you (and you can turn the system off) but it's just something to get used to. This car is not the best value (though try to option a far slower and even more dated Cayenne with the same options) nor would I even consider it best in class, but you know what you are getting into with the GLE and there are few if any surprises.