The story is told out of order, so you'll see Captain Trips through every character's eyes as they're introduced.
I was pretty happy with it. They updated parts ("We'll put it on Instagram") while keeping a good amount of the original dialogue (VERY noticeable at Hap's gas station).
I'm really pleased with James Marsden, who's as good a Stu Redman as Gary Sinise was. Frannie's sort of meh, but Harold Lauder's almost perfect. You can't really do a true to the book Harold, heh. So Harold is a King Crimson fan, and loves Eraserhead.
It was great seeing Nic Lea in the opening scene, and that he's in the Boulder Free Zone! I was actually sort of hoping for Terry O'Quinn at the CDC.