My Fitbit Sense 2 works well now for 2 years. The Fitbit Sense sleep technology seems to be the gold standard for scientific studies, but it's imperfect. Nonetheless, it's a good way to see how an individual does historically.
A GPS tracker isn't cheap. But GPS Fitbits seem to hold up better over all than the less expensive Fitbit models, which I tried years ago.
Prior to my Fitbit Sense, I owned Fitbit Surge and it was good overall (before decent sleep tracking) and lasted almost 3 years.
Moderator edit: clarified subject.
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