Bought the Renogy M1 through the UK store as it was not available on the EU store, launches there soon, and I am delighted with the service.
The M1 seems to be a solid piece of gear and works well out of the box.
It's software seem stable and has had a few updates. There seems to be no change log.
Used mainly with Bluetooth devices, 2 controller and 1 BT battery and it seems to be stable connection to them.
Added some no Renogy zigbee devices to it and all connected ok.