I would just like to take this moment to suggest people find a comfortable place to sit with a stiff drink, spliff or whatever and listen to the first chapter of the audio book - and I mean really listen, actively visualize the story and everything being described, let yourself really emotionally connect with the events as much as possible - it's a really powerful and well written bit of action sci-fi.

It's on YouTube read by Christopher Hurt, first chapter is about 40 min, I've read a lot of sci-fi and it's without a doubt in my mind the strongest and most thought provoking opening to a Sci fi. It gets you pulled into the characters, the world, and emotion without a break in the action - and for a book punished in 1959 the action is unbelievably believable, it's hard to imagine better high energy action sci-fi combat -- someone needs to make a real gritty anime of it.