They are excellent rules. I had a chance to play-test one of Firelock's concept games of the Napoleonic period at Gencon. As far as I could tell trying to weave between 80,000 participants, it was one of only a handful of historical games. Remembering back to when my new bride and I slept on the floor of Horticultural Hall in Lake Geneva well over 50 years ago, then, almost all games were historical, the hobby has morphed heavily.
The nice thing about Blood and Plunder is that you can dust off your Old Glory pirates and use them, although re-basing to a 20mm washer might be necessary. It is a complete system with room for expansion. Firelock sells an abundance of ships, figures, game cards and dice, etc. However, on the cheap, you can use what you have and a simple deck of playing cards will work. D10's D6's and anything you want for tokens work just fine, but their product line really enhances the game.
I am sincerely hoping if and when thy release Napoleonic rules it enables the play of Jean Lafitte. I always wanted to play the scenario of the Rescue of Bonaparte.
Break yer mast and stays,
Cap'n Mick