Easy to use—simple indications, just with a little 'trick' it fit 'flush' with the rail circuit breakers. I used a 5cm thick piece of wood and screwed it with a 6cm self-drilling screw onto the rail, snapped it into the base and everything was OK. It was connected to all the circuits in the store, tested, and works OK.

It is a good material but there is a problem because when it exceeds 5000 watts on the meter it has a fuse and a switch by itself, meaning it is good but not to measure the whole panel, only one device, like one air conditioner or one water heater

The only negative is that it does not fit the length of the fuses in the panel, resulting in its appearance being at least 2cm further back.

Very satisfied so far. I have connected it to the power supply that goes to the house after the photovoltaic inverter. I also see the data in Home Assistant and in eWeLink.

I use it as an energy meter from the grid to the photovoltaic inverter. Its only drawback is that it consumes about 100 W of power when the inverter does not draw from the grid.
In SOLAR-BATTERY-UTILITY mode, it would turn off. This was fixed by disabling the minimum power and minimum current functions through the eWeLink app

It handles perfectly a multi-split air conditioner 24 BTU 6Kw, apart from recording consumption, I also use it as a switch to save 6w of consumption when I'm not using it

Connection to the electrical panel directly with the A/C fuse for recording kilowatt-hours and power and history via eWeLink.

Quite good accuracy, measures direct consumption from the panel... and you see everything on your phone. Never worry again about a forgotten water heater, you turn it off from afar! Or you turn it on to have hot water as soon as you arrive.

I used it as a switch in solar and in a hot water boiler with an integrated heat pump. According to my electrician, a power relay should be installed before the Sonoff.

A reliable and economical rail-mounted wattmeter controlled by an app. One of the very positive aspects is that you can set limits on the current intensity that passes through, and if exceeded, the device disconnects.

As hardware good, serves as an automatic thermostat switch.

Software not tested as I used it with custom firmware for local automation and avoiding the cloud. (be warned this voids the warranty)

It works exceptionally well!

I do not recommend it, it disconnects frequently and you have to manually reconnect it. I give it 3 stars because when it is connected to the power, it functions as a voltage monitor and here on the island, the power company has many fluctuations and it had dropped to 214v and I had set it to shut off the power and it worked correctly and saved my motors. That's why it deserves 3 stars, otherwise it is not worth it

after 5000 watts it turns off automatically. have to remove because it turns off my power daily if I use the hot water.

I have it for four months and it works perfectly. It has several settings, such as after a power outage to enter off or on mode (pre-set is off).
The firmware upgrade is also great.
It connects smoothly to the home WiFi with eWeLink and with Google Home (Google just needs the GPS to be turned on).
I have remote access to the mobile network without any issues.
It works perfectly and I recommend it.
As shown in the photo, I also have the corresponding one for humidity and temperature.

I put it on the board to monitor the consumption on an 18A air conditioner. Unfortunately, it keeps automatically turning off and stops supplying the AC. I have to first turn it on and then the AC. It tells me about a firmware update, but it can't do it at all. Maybe I got a defective one, I don't know. I have a simple Sonoff switch with WiFi purchased from China for so many years, no issues at all. 1 star for now, we'll see.

Edit 26/1
Many people have issues and the company suggests changing the IP from DHCP to static and removing the skill from the Alexa app. It doesn't do anything. Keep away.

Edit 10/2
I removed it from the board, it has interference from the currents, I don't know... and it disconnects it. It works perfectly outside the board