The fan has a diameter of 25cm, not 40cm as stated in the description, and its speeds are 12 and not 3. For its 25cm size, I would say that its performance is somewhere between the second and third speed of a cheap 40cm fan, which is quite impressive. Up to the seventh speed, the noise is quite low, but from there it starts to increase. Anyway, it is the quietest one I have had in the last few years. The build quality is very good, but it does not justify its high price, and it has some additional features worth mentioning. Besides the horizontal rotation, it also has a vertical movement, a timer for stopping and starting operation from 1 to 12 hours, four modes, and a remote control.
On the negative side, its very high price, even at the price of 145 euros at which I received it. The length of the cord is 1m; they could have added a few more centimeters. The display for the settings is at the base of the fan, so if it is not positioned in the right spot, it will not be easy to see what is displayed. Finally, its height reaches 90cm at the maximum setting, so it needs a specific position where it should be placed; there should not be various tall objects in front of it.
For me, who has an issue with space arrangement and has used tower fans for many years, I would say that it has suited me quite well because it is quite compact and has good performance, but I would prefer it to be a bit stronger. So far, with the temperature ranging from 32 to 35 degrees, it is the main fan I use, but during heatwaves, it will not manage on its own. I would not recommend it to someone who needs a strong fan to cover a large space. I would say it is more suitable for the bedroom or for someone who wants a fan next to their desk. In all of the above, I must emphasize the subjectivity regarding noise and each person's relationship with heat.
Edit 10/06/22
I am making a small edit to clarify something. Ultimately, I think that in terms of performance, this particular fan can easily be compared to the corresponding 40cm fans, which, as I emphasized in my initial review, is quite impressive. However, as another user pointed out and I also realized, due to the smaller diameter, the air stream is narrower. This gives me the impression during heatwaves that it cannot "fill" a large space (e.g., a quite large living room), which is why I wrote that I do not recommend it to someone who needs a strong fan. If it were priced at 100 to 120 euros, I would give it 5 stars and easily recommend it to anyone. At 150 to 170 euros, which it appears at, I will stick to my initial rating and review.