I'm about 1/2 way through it. It's a fun and entertaining read, but massive in scope. Some of the middle chapters have a lot of data to wade through, but most of it is pretty accessible.
Pinker has a very straightforward way of writing that I really enjoy.
His plain talk bashing of the religion in general and the Bible in particular is refreshing for it's candor. He really destroys the myth that Jehovah is a God of love.