Date registered: Dec 2005
Location: United States
Mentioned: 3 Post(s)
Quoted: 452 Post(s)
Opinions will differ of course; here are mine. The E550 is a wonderful car, and many swear by it. Its maintenance costs (and fuel consumption) will be slightly higher than the E350 (it being a V8) but of course its acceleration will be better too (the E350 has all the power I ever needed though). 550s are also typically better equipped in terms of features, but there are exceptions.
I can't remember if Airmatic is standard on all the E550s of these years or not, but I personally steer clear of any active suspension (e.g. Airmatic or ABC) particularly in a car which is more than three or four years old. They perform wonderfully when new but become maintenance headaches (expenses) once you near your warranty expiration date. And note: many if not most extended-warranty policies specifically exclude active-suspension components.