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.
The movie never comes close to replicating the spell that Reiniger was able to cast using much more primitive techniques, which underlines a chronic problem of computer animation: its very precision squeezes all the magic from the magic lantern.