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Just finished watching it (on Blu-ray).  It looks fantastic. 

A few changes:  The movie starts at chapter 3 in the book (skipping over the whole "Losers" story.  Also, in probably the biggest change, Hal Jordan acompanies Flagg on the attempted mission to Mars instead of being grounded like in the book (actually this whole scene is very different than in the book).  I didn't care for that change so much. 

As far as the voice performances, I thought Kyra Sedgwick as Lois Lane was a little weak, but David Boreanaz was great as Hal Jordan.  I was also suprised how well I took to Jeremy Sisto as Batman.  The voice was jarring at first but it didn't take long to get used to it.

Like I said the look of it was fantastic, especially in HD.  The Blu-ray has some great extra features as well as three Justice League Unlimited episodes.