Overengineered, and overbuilt, of materials better than they had to be, by people who cared about their work. The last of their kind...a "permanent car" of a type last seen only in the '20s and '30s at the top end of the market. And right now they're cheap to buy and keep up...much like classic Packards were in the '50s (my friends who bought such back then because they couldn't afford a new Chevy...and kept them...are quite happy today).

The world is filling up with junk FAST...unfortunately it's not "old" junk, but the new junk of indifferent quality that's fresh in the stores.

Either keep a computer-free, robust, rational W123, or get something that will be a chronic pest in five years, and never give you any more satisfaction of ownership than a toaster.