Seems like a very good buy. I generally like O'Reilly books. That said I am still very disappointed they decided to stop selling ebooks directly in favour of pushing their subscription service. Other than HumbleBundle I don't know a DRM free way to buy them.
When that switch was made, I wrote a strong mail to them. Those who dislike this move and have the Safari Online subscription through their companies should boycott that too.
I used to buy eBooks from O'Reilly somewhat often, but the push for subscription, as if books are like music streaming services, left a bad taste in my mouth.
