No, seriously, I don't have a lot to say. You can read my review/summary of the plot at my entry for the book, here.
Whether or not you've read Baum's book, I recommend the version adapted by Shanower and illustrated by Skottie Young. I've read the book, obviously, so I knew what was going to happen--which didn't make the illustrations any less delightful. In fact perhaps it made them better, since I was so eagerly anticipating Young's version of all the characters.
And if you haven't read The Marvelous Land of Oz, the graphic novels leave nothing to be desired. The story is the same, and although the text is abbreviated I hesitate to go so far as to call them abridged, as the entirety of the story is presented in the graphic novel form. These are just gorgeous, gorgeous versions of the Oz stories, and I can't wait for the next one to come out.