Read the book some time ago and after watching the movie felt much the same sort of existential exhilaration - if there is such a thing. Maybe it was just the cold that I have, though. A little overacted at times, but otherwise like an exotic episode of the Twilight Zone, shot in glorious colour. The film reminded me another French film I saw in the theatre recently by the name of Cache, which I enjoyed very much. As for it's American counterpart, I suppose that you'd be looking at something like Lost Highway, David Lynch's bizarre account of a modern, urban couple trying to grapple with the unknown. This seems to be something of a genre for the French and they are quite good at pulling it off - as is evidenced with this film - with considerable style and enough depth of plot and character to leave you considering and reconsidering the film for far more than the sadly customary 10 minutes.
I almost shaved my beard off after watching it just to see what would happen. But I haven't yet. Or have I?