Working my way through this:
If you like WWI history and you're interested in the German side of the story, this one is of very high, scholarly quality. The problem with trying to find good material about Germany is a lot of published stuff is either rehashed or you run into a lot of impertinent neonazi shit that you have to sift through (this is especially true for the online stuff). This book gets into the personalities of a lot of the senior German officers. What makes it interesting is learning about how they didn't always get along with each other, specifically who and when at different points in the war. There's also a lot of pretty good technical discussion (tactics, logistics, etc.).