Thoughts on 2013 Mercedes cls550?

I just compulsively privately sold my 2012 Camaro 2ss the other day so I am currently car less and in the market. I want to upgrade to something luxurious and fast. I do not like "normal" cars (Honda, Toyota, Lexus, Nissan, etc). I have been looking at Tahoe LTZ's, stingrays, audis, bmw, pretty much everything. I loved my Camaro, was fast and fun but not so much luxurious. I test drove a $45k 36kmile pearl 2013 cls550 today (capital euro cars Tallahassee if you want to see it) and I fell in love with it. I am 24 years old and my main concern is being stuck upside down with a car payment. I hear that Mercedes and cars similar to Mercedes devalue very fast. I plan on putting 20k cash down on it up front. But out the door I am looking at 50k dollars. The dealership will not budge a dime on the car as its "certified pre owned". It does have a unlimited mile warranty for ONE year, and a available 2yr extension for 3400.00. Which they wouldn't throw in either. I literally love every bit about the car, the seats, the features, the acceleration is so effortless and it glides over everything. I absolutely love the car. But I don't love buyers remorse. I want to make the right choice and not be stuck with a fast devaluation. I am also very concerned about the reliability of Mercedes being a European vehicle, I hear they can break down and have many problems? I want reliability ESPCIALLY if I am spending fifty thousand dollars. What is everyone's opinions on this particular Mercedes model

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