It's not going to change your life. Not everybody is going to derive value from it, and that's okay. It's not targeted at everybody. I generally find it quite u

It's not going to change your life. Not everybody is going to derive value from it, and that's okay. It's not targeted at everybody. I generally find it quite useful. When running, I can aim at a certain heart rate which keeps me consistent between workouts and gives me a way to quantify if I'm feeling a bit exhausted compared to similar workouts, giving me another data point for planning the rest of my training week. It's also a useful measure of fitness and you can easily track improving fitness with it across workouts across time. It gives me a better sense of where my heart rate is and when, which has given me a bit more confidence in what I can do. It also tracks my sleep, which can also be useful. There are just a lot of useful, small benefits that easily justify using one. I can easily go without though, so it's not a must-have. If you don't need that kind of detail in your life, just skip the whole thing. I'll sometimes go months without wearing it. I don't think there's a "killer app" or a "convincing" argument. Rather, either it aligns with your goals and needs or it doesn't.