What years were W140 S500 Coupes and S600 Coupes imported to US?

I am considering beginning a search for one ... looking for something "different" and unusual ...

What does everyone think of them? Reliability, handling, rarity, most common failures, fuel mileage?

Would be maintaining myself.

Thanks!

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George Stephenson
1991 350 SDL (200K and she ain't bent, yet)
former 2002 E320 4Matic Wagon - good car
former 1985 300 CD - great car
former 1981 300 TD - good car
former 1972 280 SEL - not so good car
a couple of those diesel Rabbits ...40-45 mpg