Just received a mail from Sonoff for this, looks very nice and can be flashed to be an extender like the Xbee rather than a coordinator .
Thinking I may have a pop, but thought I'd share
For those who'd like to know more on the flashing and uses of these great little devices, please check out @danabw 's post here, many thanks for sharing!!
Not as yet, although their instructions are here. Looks a very neat solution, although it does say to need to use HA to do it.
Edit:
Scratch that, reading the flashing guide, theres no mention of HA. So I suspect, like the Xbee, after flashing you would just add to HE as a "device"?
I've got 2 of them. Using them as coordinators though.
I've flashed plenty of other zigbee sticks in the past. There are some good instructions on how to do it for various sticks on the zigbee2mqtt forums/site.