What did you think? I saw it last night and really enjoyed it (I 'revised' by reading your thread before watching as it's been such a long time since reading the actual book - big help, thank you!).
I wasn't sure how they would make sense of all the intertwining stories and themes, but I thought the structure of the film worked well and the doubling of parts helped to develop the idea of eternal recurrence beautifully.
It managed to make the tone optimistic, too, and I do like that in a film, even if it's not quite where the book was going.