The got this one during the first few months following Goldsmith's death. It was a combination of "hurry and get as much as you can before they sell out" (which thankfully didn't happen) and the need to have a lot of "new" Goldsmith during that time. I never saw the film, but it wasn't exactly a blind buy. The Jerry Goldsmith at Fox box sold me on a LOT of his early work, since I was primarily familiar with only the scores from the latter part of his career. But once I heard them, I went nuts for his older scores. Hence the "Oldsmith" user name.
100 Rifles was a big part of this awakening (along with The Sand Pebbles, Rio Conchos, and Studs Lonigan). I enjoy the mono and stereo cues pretty much equally. I don;t visit it often, but when I get the Goldsmith bug, this is one CD that getssome spin time.