Worth watching for the great supporting cast alone
I only watched this film for Russell Johnson and Dennis Weaver, but I particularly enjoyed Alex Nicol, Dorothy Malone and Barry Kelley in it too.
I know Reagan is the star, and the plot is a poor retelling of the Earp family in Tombstone, but it's a solid film. I saw it for the first time 15 years ago, and I'm happy to own it on DVD today.