Well , Its the second "Wild west - cow boy - Bang-bang" movie on the Top 250 , after "The Good, the bad and the ugly" , again from the same film maker Sergio Leone ! Although i ve seen the latter , i still have nt seen this movie ! Am gonna download it tonight from the torrent am sharing wit u ! Anyway here i one of the reviews from IMDB itself !!

IMDB review :

The "fourth" and best of Sergio Leone's Dollars Trilogy, 'Once Upon A Time In The West' is a sprawling, operatic masterpiece of cinematography. The languid pacing only accentuates the meticulously presented scenes and the Ennio Morricone score is powerful, poignant and haunting. Each major character has his own musical theme. Henry Fonda's character has a menacing and jarring score which chills and thrills me every time I hear it (I bought the soundtrack too!). Fonda as Frank is the "coldest villain in screen history" as I have read in other reviews and was cast against type in this film. When the camera pans up into his passionless blue eyes early in the movie, one sees what a brilliant piece of casting it was to have him as the villain. This movie is a metaphor on the death of The Old West and the final word on how a (spaghetti) Western should be. Not to be missed!

Torrent for Once upon a time in the west :

Here!!