I think, this film is masterpiece. (By the way, it isn't Polish film, it was created in the USSR). Vertov is indeed a great director. Unfortunately, he is not as popular as Eisenstein.
Montage is unique; magic, impressive view of the world. Different points of view to the world around: our eyes and "cinema eye". After viewing of this film you will see our world in a new fashion! Maybe Vertov's technique is the cinema of the future?