It's my first time trying out PF 2e and this book caught my eye since it lines up with my character idea. It has a mix of useful, if mild, stuff, but nothing that made me go "oh, wow". And no real ability to build anything like the cover art. One of the biggest downsides I could see for the book is the lack of defining how many bolts can be held in the Bolt Clip and Bolt Drum upgrades.

Using some of the same mechanics and format as Spheres of Might, Ultimate Engineering works to bring 'technology' to your character's fingertips. Don't let the idea of technology in your swords and sorcery game keep you away from this book. Just as Spheres of Might worked regardless of your weapon choices, Ultimate Engineering doesn't necessarily have to involve steam power or harnessing electricity. Examples in the book include technology based on plants and demon forging. Once again the crew at Drop Dead Studios has come up with a way to enable a wide array of character customization in a reasonably balanced format. Also good for DMs looking to have strange and fantastic 'magic items' without going through the crafting rules and risks of balance issues.