My GCM app updated yesterday to version 22.214.171.124. On my Lumia 950 running Win 10.0.15031 synchronization with F3HR of 24 hour heart rate data works well. Real time data and appointments work fine, too. The weather app only displays "waiting for data". I did not have the opportunity to test live tracking and other features.
Be careful as the latest Win Insider Build has broken Bluetooth Settings. So you can not pair a bt device on that Windows build.
Before this update I only had real time data synching with the app. So there are improvements, finally.