Very good & with many capabilities !!!
I have two devices.
The only problem I encounter is that it sometimes freezes when switching from automatic to manual

It does the job just fine. The downside is that it doesn't have good wifi reception (I had to install an access point on the rooftop). I have connected a 3m cable to the sensor, and it records the temperature of the solar water just fine.

In the positives, it measures kWh, can also be used as a switch, and has on-off programs.
In the negatives, its display is not illuminated and is somewhat difficult to see, and I also noticed some limitations in the range of its Wi-Fi reception (weak antenna?) and it frequently disconnects compared to another Wi-Fi device I have next to it, and it does not show me the same disconnections.