I've broken a chain once in my life so I just carry a chain break tool as part of my multi tool but I have in fact practiced with it so I know its quirks and I can use it if needed. Locally when I break down I'm most likely not in cell range or near any business, house or phone so I do want to be able to fix it no matter if its once in a blue moon. Most chain tools will work but some are quirky so my best advice is to practice and know you can use it successfully.