Thanks for the link: that&#x27;s a very thorough review. It says:<p><i>To begin, from a 24×7 standpoint, the HR values presented are generally accurate when you open the page to view them from within the band.  When it does this, it notes that the HR is ‘locked’.  I see no issues when standing&#x2F;sitting&#x2F;casual walking&#x2F;etc in this area, it matches other measurement devices here when viewing it at a moment in time.</i>
<i>However, when looking at HR data over the course of the day, it’s largely useless (just like the Vivosmart HR), due to the low update rate.</i><p>It&#x27;s got an amazing number of features, and as a casual user, that&#x27;s not one that I was particularly interested in. The accepted wisdom seems to be that if you really want HR readings for fitness training, you want a chest strap....