I'm pretty comfortable with the readings from mine. I've been wearing it for 4 months now, and based on deficit, weight loss about right. As stated it seems to underestimate certain activities, notably bike riding, yoga, pilates, maybe to some extent strength training. But readings for cardio pretty close to my treadmill or a heart monitor.
The biggest benefit is that I am so aware of my activity outside of working out. I have made many little changes (parking far away, using stairs, not hanging on the couch as much) because of this gadget. I want to hit my burns for the day, and will move more to make that happen. And, that knowledge is priceless.
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