Both entertaining and useful, what more can you want from a book? The 21 pirate groups outlined in the book, including the ships, motivations, and personalities of each group are a great addition to any campaign.
Another well designed product that further enhances a great product. The 21 sets of pirates are layed out well and easy to read. A few more descriptions on other crew members, their armories, or their ultimate goals would have been nice.
For a short book (31 pages) it packs a good punch.