Apple Watch as HRM with Sufferfest

I know there is interest in Apple Watch as a HRM but there is no direct support for this yet - but this is working for me now with the NPE heartbeartz adapter. Sufferfest recognizes this as a BLE sensor for HRM. I have two rides with it so far, the first had a lot of dropouts but I put this down to some interference, the second had no dropouts at all ( I moved the adapter further away from watch/computer and turned off my phone).