First read this series years ago and couldn't put it down. It seemed to be a pleasant change from Stephen King's usual style. I have read the series three times and hope the movie does it justice.
Apart from the Lord of the Rings series, Dark Tower by King and the Chronicles of Thomas Covenant the Unbeliever by Donaldson are the only series of books that I could not put down for any length of time. The style of writing invited me into the story and had me live it with the characters.