I've yet to see the movie (and, actually, given the chance I probably wouldn't see it at all - I wouldn't want to ruin my mental image of everything from the book), but it's my favorite SK book of all time. I've read it twice myself.
IMO, the DT series had a few great books (Gunslinger, Wizard and Glass, The Dark Tower), but a few I really didn't enjoy at all (Drawing of Three, Wastelands, Song of Susannah).
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