I recently watched this again, for the first time in about 20 years. This movie shows that you don't need a big budget to make a really good movie. It's a little creaky in its flow sometimes, but the strength of the story and performances holds it together well. The actors playing the good guys are all excellent, and the two playing the bad guys (Gross and Soul) are startling and superb. Gross is more quietly creepy, and Soul boldly creepy. Once the movie gets rolling, you're afraid every time either of these guys is with *anybody.* The violence spread throughout is not gory, but it's certainly brutal. If anything, the lack of gore heightens the sense of coldness about the two bad guys. The final shootout is stark, eerie (especially regarding Soul's character), and very sad.
From other reading, I understand that the events in this movie, including the details, deaths, and injuries in the final shootout, are quite accurate. The real events were more spread out in time than I felt watching the movie, but I think that was for the better.
I cared about the FBI guys, even though, with a true ensemble cast, we see each of them only a little. That's a serious testament to the movie's craft and performances.