Perhaps it's the Michelin tires on the car, but this has to be one of the smoothest riding cars we have owned. The only drawback, if you want to call it that, is the acceleration. Once it's moving though, it's easy to find yourself doing 90. For comparative purposes I drove the sedan, and the two ride completely different. I can't see spending another $20,000 to get the E class wagon, simply to get more speed. I doubt it could be more comfortable that this one. The gas mileage is good and will only improve once it's broken in.
The ride. The controls on the steering wheel, the sound system. The seats are very comfortable.
Get rid of the sub menus and have more choices at the "main" level. It's a hassle to find the feature I want quickly and I am afraid of resetting something I don't want to touch.
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