The value of these things is correlating things and thanks to services like Human API or Exist, people will do the heavy lifting for you. I personally use Fitbi

The value of these things is correlating things and thanks to services like Human API or Exist, people will do the heavy lifting for you. I personally use Fitbit One and Basis, waiting for Amiigo to arrive, and, yes, I backed HealBe, too, although most people say it's a scam - I really need the unique data it provides. It's important to accept that none of those will be accurate. I personally can live with 20% off - some data is still better than no data, don't you agree?