Even though this probably belongs in the Open Discussion Forum instead of cluttering up Tech Help, I can't keep myself from offering my $0.02.
Listen to Benzmac. It's all in how you take care of it.
I believe that the new MB's have even more potential longevity. The only down side to the newer ones is that IF you have some sort of freak electronics failure after warranty it will be expensive. But when you look at the overall equation, you will probably go more miles in an MB than anything else IF IT'S TAKEN CARE OF. This means that most likely you will get back your larger investment because you get more miles from the car.