Updated for the 3rd time... Previously 4 stars, then 1, now 2. When the app works, it's great. But not stable. I shouldn't need to reinstall and reconnect my fitbit from time to time to make it work. It's a waste of time and energy that I rather spend on working out... Today, stopped tracking steps, sleep, heart rate and no way yo add the tiles back. The app on my PC stopped to sync and won't reconnect with my fitbit and the app on the phone seemed to have lost basic tiles, pretty frustrating.