What I wanted is a watch that would be easy to read, that would not lose even a second, that I wouldn’t have to worry about the battery or charging, and that I could see at night.
World times, lap times, stopwatches, etc. (which it has) do not interest me. For such "things" there are mobile phones!
This particular one meets all the above, except for one thing. The date is not so easy to read for someone with presbyopia like me. It could be a bit bigger.
However, it does not lose even a second, since it synchronizes with the mobile (which in turn synchronizes with the world time), it doesn’t need charging, since it charges with light (and in winter its exposure to light is enough so it doesn’t run out of battery), and it is visible at night, since its hands are luminous and it also has lighting with a button.
Let me not forget, with one (other) button you can find your mobile with an audible alert.
UPDATE: After 1.5 years, it works perfectly, as I described above. I have never corrected the time and it is constantly charged, winter and summer, without me doing anything special. Even though I have bumped it a couple of times, it doesn’t have the slightest mark. It is like new. I don’t use the additional functions because I am not interested, as I have already said. Its bracelet is sturdy and durable. It opens very easily but only when you want it to. There is no way it will open by itself.
UPDATE: After 2 years of wearing it constantly, nothing has changed from what I have already mentioned. I am impressed, though, that some other users mention that in winter it doesn’t charge from the sun. On mine, the charge indicator has never dropped below 60%. The lowest I have seen is between the 2nd and 3rd line (out of 4 in total). Note that in winter I wear sleeves that usually cover it. Maybe they got a faulty one – I don’t know. Also, I should mention that I protect it from hot water, as with all waterproof watches. Every time before I get in the shower, I take it off and wash it with cold water.

Purchased in March 2021 for 200 euros... it is a smart and durable watch, but at the same time not really... meaning that if you compare it to modern smartwatches, you could classify it as a hybrid. It has Bluetooth, which synchronizes the time with your phone, so you don't have to worry about it being a few minutes behind or changing for daylight saving time. All of this is done automatically thanks to Bluetooth. It also has the option to find your phone, like all modern smartwatches do. However, it doesn't have any other smart functions, even though it could because of Bluetooth. A major advantage is that it charges from solar power, so you don't need to change the battery or worry about the watchmaker not sealing it correctly and damaging it when it gets wet.

In terms of durability, the watch case is made of steel and is resistant to scratches, but the bracelet easily gets scratched.

Overall, you will be very satisfied if you know why you want it. Don't be fooled by the Bluetooth, yes, it has its benefits, but ultimately, I believe the most useful feature is that it charges from solar power and the time synchronization with your phone. Knowing the time in different cities around the world is something that ultimately doesn't matter.

After a year and a half of use, as of December 17, 2022, everything I have already mentioned still holds true. It is a decent watch for its price. Just be careful not to wear it to work because the case gets easily scratched.

When the battery level reaches 50%, the light and Bluetooth are turned off to save battery. At first, I thought it was broken :)... As soon as you expose it to sunlight, it recognizes that it's in the sun and automatically charges quickly in about 2 hours