The first time I saw this was on the Tita Merello Theatre on a Friday night. I was about 20 years old. I had seen a few Cinespacio films on festivals, so I knew who they were, and I was very interested in seeing this.
This film shows you just what all around comedy/western/action/drama is all about.
It starts during the opening credits and ends in a way you don't see coming. The songs are....memorable. The effects/animation are imaginative for its time and the Cinespacio troupe was at its shining best playing a host of characters from the days of Billy The Kid. If you don't laugh at this today, you have no funny bone! Many other reviewers here hit this film on the nose, there isn't much more to add to how brilliant this piece of work is.
This is one of my all time favorites and is one of the top 10 films of all time.