I read the reviews and then bought it.
Everything is good about it, but. The quality is expected. The engine works very well. BUT the base is rubbish.
Plastic without durability and no matter at what speed the fan works, it makes a synchronization by hitting the floor, no matter where I put it [it's not the fault of the floor leveler.. I had to put two bricks on the base to stop the synchronization.
If it had a more solid base, it would be excellent

Well, simple and fast.

-honest materials, hard plastic and aluminum.

-very good controlled power.

-clear vfm for 25 euros.

Extra:
According to quick tests I did with an application from the playstore, with my mobile, the noise is between 57, 63 and 68 decibels respectively with the 3 scales. Now you can download an application yourself, so that you can compare the noise with something else in your house, to understand roughly the intensity. Oh, also it is a DIY construction, but easy assembly.

It makes very little noise for the watts it produces. Easy assembly - it does not have very clear instructions for assembly.

I am posting this review simply because I see it has 1 star and it is not a fair rating while other models have better ratings, without being superior anywhere! There are several similar cheap models that make "all the noise". However, when you have spent about 25€, you can't expect a quality, quiet, and powerful fan... I have had it for 4 years and I can say that it does its job, it is a powerful fan (it sounds like an airplane at high speed but it's ok at 1) it is made of cheap materials, however, it has lasted for 4 years and is going to the 5th. I had it running on an island (for several hours). Tip: Not suitable for a bedroom because it is noisy during sleep... but other than that, I don't see anything negative.