For myself, an impactful difference in my life over the past year with change in how I've used it. I've had the S3 for three years. When I upgrade, it might better stomach the $600CAD the series 6 starts at here after tax, but the device is now something I never do without.
Before a year ago, I kind of liked using it... The convenience of seeing texts, weather, controlling volume of headphones and song from the watch. All of that is helpful, sure, but that hadn't really come across as a feature I'd really miss without. To answer what changed my preference for it... all comes down to applications connected to other hardware. With use of a continuous glucose meter, reading is sent to my phone via bluetooth every five minutes, conversely that reading is always displayed on my watch face. Trending low or high? Buzz on the wrist notification. Out of range? audible alarm from the watch. For someone trying to stay in between the lines with type 1 diabetes, convenience of seeing that reading readily, and correlating closing an activity ring once each day to more linear sugar levels has made a huge, huge difference in my control. On lab tests? No longer diabetic. Sure, five injections a day, and careful assessment of where I'm at 100 times a day, but the watch in combination of a CGM has been life altering.