Saw this film over the weekend and it was fabulous, it really was. The animation is gorgeous, incredibly detailed and very cinematic. Some scenes, particularly the airborne ones were even beautiful.
The story was good too, I have no idea how close to the book it is, as none of mine have read it (although we're all going to now!) but the Hero was funny, snarky and likeable, the Dragon was just adorable (want one!) and all the supporting characters were interesting and developed enough for you to actually like them.
I went with DS2(9) and DD(6) and BF(38 and convinced it was going to be bad) and they all loved it too.
It's out on 31st, and I'm recommending everyone to go and see it (don't usually rave about films on here unless someone specifically asks about them, but this one deserves it!)