This is a great tool if you are using real automotive style, waterproof, or weatherproof connectors. This will crimp three sizes of open double barrel type crimp terminals, and two sizes of wire seals. Works great with the Waterproof Circuit Breaker Kit, or the Waterproof Relay Kit. But really this is just a good tool to have in your collection.
This is likely the most economic solution for terminal crimping you'll find anywhere on the web. It's very well made and will handle any task you throw at it with the same proficiency as it's $400 counterpart crimp tools. This tool also has a parallel jaw motion which helps keep the terminal in the correct orientation when crimping.