This is one of those movies where the quality of the acting is far above the material itself. Michael McKean and David Thornton are joys to watch. Also, though the plot is derivative, it is very knowing about business trips and sales people, and if you've ever been on a business trip, you'll find yourself laughing and nodding at many points. The movie never seemed false or strained, just a little weak at the very end. Up to that point, it's an above average investigation of salesmen gone bad. It's a bit like "Very Bad Things" only played more for comedy than for dark drama. Jake Weber, though British, does a very good job playing an American, something that cannot be said of many of his countrymen.
Review of 100 Mile Rule
