Interesting discussion with my wife about this. &quot;Yeah, but everyone&#x27;s knows &lt;LED HR monitors&gt; aren&#x27;t accurate.&quot; That isn&#x27;t the point, honey. FitBit claims they <i>are</i> accurate. And beside, the only reason you think everybody knows that is because I, a life-long distance runner who has a closet full of monitors, told you and because <i>you&#x27;re a PM for a competing product</i>. It is not inconceivable that someone outside that bubble took FitBit at their word.<p>I&#x27;m no more a fan of class action suits than anyone else, but I can see it in this case. Sometimes the only way to effect change is not to just &quot;vote with your wallet&quot;, in which case FitBit won&#x27;t change their claims when l&#x27;il oil&#x27; you didn&#x27;t give them $100. They might change when a collection of customers sues them for a few million.<p>(Disclaimer: never worn a FitBit, all assumptions of accuracy are based on using other LED-based HR monitors, all of which are hit or miss on accuracy in comparison to a chest strap.)