The story line is well done.  The gore is a bit over the top though.  The first half of the first book sucked me in as it was fairly realistic with respect to the technology.  As the story progresses, the tech becomes more fantastic.  Maybe we're only a few years/decades away from the things described, I'm not sure.  Overall, it's a very scary and thought provoking story.  I recommend these highly to anyone who like thrillers or science fiction.