I'm currently wearing the Freestyle Libre 3. It communicates with the app every minute. I have something between pre-diabetes and diabetes so I have a slight chance at being able to treat my condition with diet/weight/exercise. Its definitely changing my behavior--I'm aware that it is not as accurate as the stick test but I have a plot of my blood sugar throughout the day. Currently I'm consuming very little carbohydrates. I've learned from my own data what foods will cause my blood sugar to spike.

The app is missing some obvious features, and people are right to complain, but its way better it seems than devices that came before.