Excellent film
I saw an advanced screening of this earlier in the year (while it was far from complete - no CGI or anything at that stage) to be part of an audience feedback session. I went in with utter trepidation as it sounded like a chick-flick - but my fiance insisted. All I can say is, make sure you go and see this, it was genuinely brilliant. Kate Winslet is fantastic, but Hugo Weaving steals the show in my opinion.
I can't comment on whether or not it does the book justice or if there are glaring discrepancies as I had never even heard of it prior to seeing the film; however, as a stand-alone film, I cannot give it enough praise. We'll definitely be going to see the finished product on release.