I have bought 3 and have been using them for 2 years. Overall, they are very good, they do what they promise. I remove one star because they do not support WiFi 5GHz and because the software needs a lot of refinement but seems neglected. Also, while you can set temperatures adjusting by 0.5C with the buttons and Macro commands, you cannot set decimal temperatures in the scheduler.

It has not yet been a long time, but it functions flawlessly and has many options to schedule operation time and temperature. It has not disconnected from WiFi even once. For those interested, it can be connected to Home Assistant through "Tuya local" integration.

It is programmed to show that the space has whatever temperature it wants... for example, now... while outside it's 22, it shows 04... a great inconvenience and difficulty in installation from an electronic perspective. I was stingy to spend more to get a good one and now I'm paying for it with electricians. Such a shame, so much wasted money and frustration

Very good Thermostat. Great variety of settings, easy connection with wifi. A bit difficult to install and connect electrically if you are not an expert, you will need to call an electrician or a heating technician.

It worked perfectly for 2 years until it suddenly burned out for no reason. I recommend avoiding Hysen thermostats or any other knockoff that looks similar to Hysen. I replaced it with Siemens RDD50.1 and we'll see how that one goes.

Easy connection, just follow the steps for wifi connection. I called an electrician for the power connection.

Attention, this thermostat needs power to work. Luckily, my previous one was powered, otherwise I would have had to pull it from somewhere.

I highly recommend it for its price - value for money

Several connection problems between the phone and the thermostat. Good price but many issues and minimal support for this device in Greece to solve them. What a pity.

Very good value for money. It has never disconnected from the internet for 45 days. The application is very easy. You can program it for the whole week on how the thermostat will work. I am very satisfied.

Update: It performed excellently during the first winter. We moved and I had to reconnect it... Obviously, I didn't remember the connection and I must have done something wrong and burned it... Be very careful with the connection because it requires power supply. If you are not experienced, you may end up like me.

Update: I brought the boiler's maintenance technician for the annual maintenance, he connected the thermostat as well and everything is okay. Maybe it's the best thing you can do. Have it connected during the maintenance as well