Much better than I expected. Initially, heart rate dropped drastically, but that's because I wore it like a regular watch. You must wear them over your wrist. I just switched from my whoop to this one because it gives me a lot more analytics and it's a real watch with other features :-) Comparing side by side, Garman gave a very similar breakdown of sleep cycles and heart rate, but then also: temperature, Altitude, cadence, a free very deep and easy to use running program, a way to view all my data without having to use my damn phone, and much more. The biggest problem with Garman is that it has so much to offer that I had to watch a lot of YouTube videos to figure out how to use it. For everything it does without paying a subscription, the Garmin is a superior device in my opinion.
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