Reliable in temperature measurements. + - 0.05 degrees.
Large numbers.
For me, the negative is that the screen does not have a light, it does not have a small lamp that turns on and off. Only a faint design.
Also, it does not have an on/off button.
None of these are primary compared to its reliability. And its brand.

Very easy to install. The temperature measurement is accurate. The room has a more balanced temperature. (Before, I had an analog one of a different brand and when it turned on, I had too much heat until it turned off). It is also very simple to operate. You set the temperature you want, and when the room temperature drops 0.5 degrees below the selected temperature, it turns on. As soon as the room temperature rises 0.5 degrees above the selected temperature, it turns off. During installation, the technician did not connect the neutral wire (probably because it operates on batteries). He connected the other 2 wires and insulated the neutral wire. I have been using the thermostat for 2 months now. I highly recommend it.

Easy to use, it adjusts the temperature with precision. What I like is that it turns on when the set temperature (22°C) drops by 0.5°C (to 21.5°C) and turns off 0.5°C above the set temperature (to 22.5°C). I have noticed that it saves energy compared to the faulty analog one I had before. (The house has very good insulation with minimal heat loss). If I had been patient and didn't adjust the temperature slightly when I wanted to feel warm, the energy savings would have been more noticeable. Finally, the batteries last a very long time!! (about two years)

It is good for the job it needs to do, but I would like to see both temperatures and also add a light so we can see it at night, Siemens

Easy to use with reliable room temperature measurement and easy to install with the reliability of Siemens.