E350 2011 Owner here. Bought at 85k now at 145k 3 years later. You would very hard pressed to tell it had done that kind of mileage. Bought from a main stealer and bought a service package at the same time which brings the cost to about the same as the independent.
Enormous inside with seats up and down. Self levelling suspension means you can fill it to the brim and it still drives! Its quick, no matter how many people you have in it, huge torque and just eats up the miles. By far the most relaxing car to drive long distance on motorways and A roads. Back roads and b roads not the optimal car.
Would I by again? Yes. Lottery win tonight replace with debadged E63 and the neighbours will only notice when it starts up!