Ha! I just received two-pack of outlets and this article forced me to install. I have Unifi as wifi, with both 2.4Ghz and 5Ghz on the same SSID. Out of the box, I was not able to configure it in HomeKit. So I googled manual and found, that after holding power button for 5 seconds device will factory reset. After factory reset, I was able to add device to HomeKit without issues.
Note, that device connected to wifi and was reachable on port 80 (simple http web server with username admin/admin), so not sure why HomeKit refused to add the device. Perhaps something with timing.
Anyway, firmware upgrade requires an app, which is... buggy. had to force quit for it to show firmware update is available for device, but after upgrade that http server on port 80 no longer reachable. So recommend updating firmware.
Overall, I'd give so far 4 out 5 for this outlet.
Note, that device connected to wifi and was reachable on port 80 (simple http web server with username admin/admin), so not sure why HomeKit refused to add the device. Perhaps something with timing.
Anyway, firmware upgrade requires an app, which is... buggy. had to force quit for it to show firmware update is available for device, but after upgrade that http server on port 80 no longer reachable. So recommend updating firmware.
Overall, I'd give so far 4 out 5 for this outlet.