The first pattern in the book is Receding Shells, which alternates between shells and double crochet posts. The shells have some back post crochet in them. Overall, I wasn't too impressed. Perhaps I needed a lighter yarn and tighter stitching? I used a K hook and Caron One Pound Blue yarn.
I found the stitch itself to be fairly easy. I did have trouble getting the right number of chains in the beginning, but I think I may have been just messing up with the stitch instructions (there are a lot of steps in each repetition).