Has anyone actually had a chance to try this feature on the Apple Watch 4? All the demo videos so far keep saying the feature is coming but no one actually has used it yet. I'm curious in how frequent it produces false positive results and in what types of situations or activities.

Having said that, I love the direction Apple is taking with this product. Smart watches have been on the market for quite a number of years now but they're pretty much restricted to being gimmicky devices only as most people don't find it very useful or have a real need for it. If Apple could achieve the breakthrough in blood glucose monitoring feature then I strongly believe we will see mass adoption in very near future.