I've heard very good things from everybody I've talked to that's seen it. I myself haven't had the chance, unfortunately.

Every time one of the new movies comes out, my mom re-reads all 7 books just before seeing the new movie. I always tell her not to because every time, without fail, she walks out hating the movie because of how different it was compared to the book. Usually she warms up to it later, but she still doesn't understand how Half-Blood Prince can be my favorite of all the movies, or how Order of the Phoenix can be my second favorite.

Anyway, she re-read all 7 before seeing Deathly Hallows Part 1, as per usual. She called me after seeing it, and she didn't have a single bad word to say about it - it instantly became her favorite of the series, which says to me that it's pretty damn faithful to the book.

She did say that the scene with the Horcrux showing Ron the vision of Harry and Hermione kissing was "too intense" - apparently Harry and Hermione are naked in the scene.