At Jackhammer's suggestion, and rightfully it's a very well shot movie, very intense surreal atmosphere(mainly due to the very odd yet awesome sound track which I felt was overbearing at first but grew on me). Fantastic colors(why do 70s movies sometimes look better than today. At least much better than 80s and 90s films?). It's not without faults(a few silly looking scenes here, and there. Continual mispronunciation of the word 'occult' int he dubbing. Said 'ahh-cult' like the guy overseeing it is some sort of Texan with a big white cowboy hat, and six shooters in his belt), but it's a damn entertaining movie.
Side note, the poster must have been made by somebody who hasn't seen it, as it seems to be a reference to not a single scene actually in the film.