This is hands-down one of the best firearm and equipment supplements I've read for D&D 5th edition. The rules are well balanced between complementing the default playstyle and properly representing the equipment of the era. The weapons list is thorough, their take on armor is another great compromise between the historical reality and the needs of gameplay. The fighting styles and feats are useful without being overpowered. But hands-down, the best thing in this supplement are the artillery rules. Amazing and worth the price on their own.