I made it through the whole film without weeing (quite a feat for 6 months pregnant ).
It felt a little rushed, but I did enjoy it. As with all HP films, you need to go in ready to watch a film, and not an adaptation of a book, and you will be fine! I used to get worked up at how much change, but since starting with that view, it makes it all enjoyable.
So yup, loved it - the darkest of all so far (but then so is the book)... I do think the 12a rating is a bit steep, but since I don't actually have an 8 - 12 year old, I'm probably not much of a judge!
The rest of you - enjoy it when you get there!!!