Hi all. First off forgive the noob questions.

Ive been toying with the idea of getting my first mercedes, a 2010 E350 4matic Coupe with around 30k-50k miles on it. I was wondering if those of you who own one would be kind enough to tell me what things i should look out for when i go and see a few of them?
Are there any common issues i need to be aware of? I was originally interested in getting a porsche cayman but for some reason i do like the look of the coupe!

Much appreciated!