The first thing I did after the Snowden leaks was read through the entire thing and after doing so I really wished I had done this years earlier. There's very few books that I think should be required reading across the board for software engineers, but this is one that I do think everyone writing code should read every page of.
In general, the authors seem to subscribe to "crypto is black magic" school of thought, which doesn't make for good pedagogy.
I found the course pretty hard as programmer with a strong interest in crypto, but no formal CS/maths background. The coding pieces were fairly straightforward, but the maths hurt.
It is in my "summer reading" pile.