I purchased the 420 SEL with 35K miles for the price of a new Maxima in '99. The S Class has a smooth, comfortable ride and has the feeling of a bank vault. At 65 mph you can hear the ticking of the still accurate clock. This S is spacious, handles well under all conditions, and even at 17 years old is better than most new cars. The car still garners respect and perhaps best of all, it is long paid off. I have been told by more than a few Mercedes experts that the '91 420 SEL was one of the best of the modern Mercedes Benz autos. They are an investment. When you fix a Benz you still have a Mercedes Benz.
The leather seats still are excellent after all these years. Much better than the typical soft Japanese or American leather seating. Overall quality and integrity is very fine.