A nice book overall. I like the rules for ship construction, and the crew rules give your loyal band of cutthroats a bit more personality than just having them gain skills. Lots of good background info too about pirates, sailing, and more. There's enough here to give you a good handle on the pirate days even if you haven't read too much about them elsewhere. The information would also be useful, but less so, for someone running a game with piracy taking place outside of the 17th-18th century "golden age".

I do have one minor gripe, and that's with the treasure table included. The list is nice, but all it says about price is "The actual value of the cargo is highly dependant on your individual campaign." I was hoping for a table that gave me at least some suggested values so pirate PCs could sell their loot more easily.