I like the GI book, I looked at it briefly awhile back. They are obviously not meant to be exhaustive reviews of esoteric diseases. But I found them very good for reviews of basic, commonly seen diseases (i.e. types of gastritis). I would imagine they would be very good for someone who is learning about a certain area, or someone who doesn't see a ton of cases in the area.
I believe there were also lots of charts, algorithms, and helpful images. It is not as text heavy as other books.