I saw this at a sneak preview last night. I thought it was pretty good. The setup of the spread and the race to trace it back an find a vaccine were really well done. The characters were all very believable. I think the slightly documentary-like feel of it, the way it was shot works well. I did have a few problems with it though. The film shows society beginning to break down, and you here reports of millions dead, and yet the scope feels far too small. I guess its because the film focuses on just 5 or 6 characters and what they see but really, it somewhat like Daybreakers in way where you here the problem is global and yet you just see a few different locations. The film also ends on a weird note.
Overall though I quite liked it.