Like all cars they can be expensive or cheap to own. My neighbor has had 3 of them and just got a W220. His first one ran it about 80k. Nothing but issues. The second and third one he got ran fine all the way threw 100k. He now has a 2002 S600 and loves it more then his W140.

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2015 ML350 4Matic. Wifes DD
2015 GLK350 4Matic. My winter DD
2012 E350 4Matic. Road Trip car
2009 CLK350 Coupe Designo.Kleemann Tune For nice days/DD
2006 CL600. V12.Eurocharged Tune. Enough said
2005 CLK55 AMG Coupe.Kleemann Tune. For the sound and style
2004 CLK320 Cabriolet. 2005+ Interior swap. For the sunny Florida days & beach days