Yes it is a very good & long book to read, but I'm not gonna give u any spoilers lol, but it's a really good book (which is why they decided to make a movie about it) so yes you should definitely read it! Enjoy! :)
It is completely differen from the Twilight series (so no vampires or anything). But it still is fantasy and the story flows really well. It is a very long book, but that is because it is not split up into two or more books, as is usual with this kind of story. It is a little more adult than twilight, and it shows that Stephenie Meyer is not just a one-hit wonder.