There is little to fault in regard to the 2009 Mercedes-Benz E-Class' comfort and quality; space is good, seats are comfortable, and quality is what’s expected of a Benz.
The build quality of the Mercedes-Benz E-Class is regarded as very good. Edmunds feels "materials and build quality fully befit the big-bucks price tag." ConsumerGuide remarks, "cabin decor is modern and tasteful, with quality materials and top-notch assembly." "Structures seem impressively stout," they add, which may help to explain the 2009 Mercedes-Benz E-Class' "well-muffled" wind noise. The diesel E320 is "little louder overall and nearly devoid of traditional diesel clatter."
In their review of the Mercedes-Benz 2009 E-Class, ConsumerGuide finds that "six-footers get good headroom and plenty of legroom. The seats and tilt and telescopic steering wheel have ample power adjustments to tailor a good driving stance." However, if those same folks want to sit in the backseat of the 2009 Mercedes-Benz E-Class, it's a different story: "Headroom is limited for six-footers, legroom grows tight behind a tall front-seater, and foot space is only adequate." Edmunds generally likes the seats in the Mercedes-Benz E-Class, saying that "the seats in the Mercedes E550 are firm but ideally shaped to provide proper support," but they are somewhat miffed by the fact that "the lumbar support adjustment is manual, not power as one would rightly expect in a luxury sedan costing $60 grand."
Edmunds mentions that the Mercedes-Benz E-Class trunk lid "opens itself completely at the push of the key fob's button," but Mercedes-Benz vehicles from the '60s featured trunks that closed themselves. "The trunk isn't very tall and the lid hinges eat into space," adds ConsumerGuide. Mercedes-Benz 2009 E-Class in-cabin storage of small items is "only average" according to ConsumerGuide. But a split folding rear seatback is available, an "unusual feature in the class," they note.