You may some stuff here on an old thread......
Fitbit heart rate tracking is dangerously inaccurate, lawsuit claims
.......that back in March. Still wearing mine, some good, some bad, some ugly:
Good.
Resting heart rate function and occasional look at how far I have walked and the use of it as a watch. A friend of mine has a pacemaker and she tests all wearables for a charity to compare against her very real pacemaker data. The charity can then advise punters with dodgy tickers. The Fitbit hr is the winner, so far.
Bad.
Anything other than above, I'm pretty 'so what' about other data but that's not to say it has uses, for you. I don't count calories, log food, don't wear it for training or exercise, other than my walks and, as others have said, there is more to sleep tracking than just time in your scratcher. I've thought about scanning my barcode result of disturbed sleep patterns at the shops to see what I can buy with it......sometimes it appears I've had no sleep but feel ok, others I wake up feeling I've been steamrollered yet I get awarded a star for sleeping well.......you know a bit crap, really. But, a few rubbish nights and I see a couple of bpm in my rhr, so interesting to know that but that is more to do with rhr tracking than sleep, still.....
Ugly.
If you are untrained or in poor health and going for working in a heart rate zone (as many people do) then, given its wildly erratic and unreliable readings during higher intensity, should it be used outside the admissions unit of a cardiac ward? I occasionally burst into a sprint walking with my dog........doesn't register a significant change of pace but can log some walks sometimes at a high heart rate, over my maf number when clearly it is an easy pace, so bit of an issue. Maybe I need to see a cardiologist!
Conclusion.
Great for tracking resting heart rate and probably really good for encouraging more low level activity for people who are inactive ie the steps goal. Mine was a birthday present and all said and done actually really like it......would I buy one? Probably not, haha!