I guess this film is the answer to every single time we asked ourselves "what if?". I did not enjoy it but I can appreciate the concept and do believe it's worth watching, at least for its uniqueness in the structure. However, even the concept is not entirely original, as admittedly inspired by Kieślowski's Blind Chance.
High energy take on parallel universe / groundhog setup, very much of its time and expertly put together, especially in the running scenes where Tykwer partners visuals and music very effectively. Exciting, hinting at deeper matters but ultimately worth watching simply because it's such an enjoyable ride.
I couldn't believe that 81 minutes had passed. The title represents all the context of the film, it's a really fast movie, full of adrenaline. One of the most important factors in the film is the music, it gives all the meaning and all the sense of speed to the picture. Probably my favorite scene is the intro of the film, it seemed to me like a techno-pshychedelic videoclip, with an excellent work of edition.