It is a seminal work. It is very accessible and it is organized in such a way that you can read it in short snippets rather than having to deal with long chapters. Highly recommended. My priest draws from it for his sermons during the Great Lenten season every year. It helps to put so many things into perspective.
I wrote a more extensive review of it. I don't know if I still have it, but PM me and if I find it, I'll email it to you. No promises, though.