you are getting a better car.
I happen to think so, too, but this is VERY complicated and so many people discover only after purchasing a Mercedes what "better car" means to them.
To many it means never having any repair issues and it means service that is cheap and easy. This doesn't describe Mercedes.
Many seem to want to think that a Mercedes is nothing but some sort of vague status symbol and all the appeal lies with the star on the hood and maybe the cool styling. Underneath all that, they really want a 50-year-old design smallblock engine and everything else "iron," too. Many acutally and foolishly want "dipsticks!" This doesn't describe Mercedes, as its role is to lead in automotive technology (that's REALLY where the "status" lies) and this isn't cheap and this is never dead reliable.
Lately--and as is nicely described in today's Wall Street Journal
--many folks want tires on their car that last for 40K miles and are cheap to buy. That doesn't describe Mercedes, as all its cars are "Autobahn ready" with expensive performance tires fitted that mostly don't last longer than 25K miles. Even the "mommy" minivan the R-class.
I think the following is a good analogy.
Think of a Ferrari. Especially an older one with six carburetors. Now conventional wisdom is that such a car will need a loving mechanic and lots of his time.
Now understand this: a Mercedes is a LOT closer on the spectrum to a Ferrari than it is to a Camry.
Be informed and be ready.
PS: Mercedes stopped being taxicabs with the W124 and when it decided it wouldn't let Lexus put it out of business. References to older Mercedes are meaningless (and those cars are ridiculous) in the 21st century.