Gene Wilder has such a way with understated comedy (see Young Frankenstein) and Harrison Ford has the roughness needed to portray the wild west (see Raiders of the Lost Ark). The two of them in a comedy was just a stroke of genius. A great movie at an incredible price. You've got to add it to your "classics" collection.
This one is neither crude clowning nor crude prejudice, but a literate and knowingly directed satire which lands many a shrewd crack about phony Five Year Plans, collective farms, Communist jargon and pseudo-scientific gab.