This movie shares a lot of elements with other Euro-westerns. Those who are very familiar with the genre will recognize similarities to films such as The Good, the Bad, and the Ugly, The Mercenary, Fistful of Dynamite, The Stranger and the Gunfighter, and other spaghetti westerns. Recognizing these common themes is part of the fun of watching this movie.
The story is full of spaghetti western clichés presented in a fun, tongue-in-cheek manner, yet it still delivers in the violence and action departments as well. We even get to see some of Franco Nero's trademark machine gun wielding slaughter.
The music score is very good. It matches the tone of the film, seems right for a slightly off-beat Euro-western, and definitely works in this movie.
The movie boasts a phenomenal cast with Franco Nero, Eli Wallach, Lynn Redgrave, and Eduardo Fajardo. It would be hard to make a bad spaghetti western with those four playing the main characters, but I do have to say that although this movie was good, I think it could have been better. The acting and direction just seem a little bit sloppy. I suspect that either they were having so much fun making it that they were too relaxed to take their work seriously, or that they just didn't care all that much about the film. I prefer to think that it's the first reason. The US release (which is the version that I saw) also seems to have been edited way too much, probably to make the film shorter. My guess is that the movie is much better in its complete form.
At any rate, I highly recommend this movie to those like me who have seen and liked lots of spaghetti westerns. To them it will be a fun movie. Others might not get very much out of this film.