This particular cleaner (and ionizer) is reliable, quiet, and economical. We have another one that has been running almost continuously since the COVID era. I don't think it's as good as other, more expensive and branded products (like DAIKIN, for example), but it is clearly cheaper and the filters are reasonably priced. Since we have a particulate matter meter in the company, I confirm that for normal levels of pollutant gases (office conditions) it is effective.

It has been in use since 18/4/2024 in a professional space (office) of 25 sq.m. where there are no cooking or other odors other than cigarette smoke, when I received it new on 10/4/2024 it was not working and was returned to the manufacturer, who repaired it (communication and service were excellent from the inventor's side).
Although the professional space of 25 sq.m. (office with computers) is used for about 10 hours daily, I have the product operating 24 hours a day (ensuring that there is lighting in the space so that it does not go into standby mode).
However, even though I always have a window slightly open to ventilate the space,
The product has not significantly improved the air quality, in terms of cigarette odor, even if it operates 24 hours a day.
There is an indication at the top regarding the air quality, which has 3 stages:
Green OK (good quality)
Orange so-so
Red poor air quality,
In my space, it will either be red and then the device operates at a higher intensity and noise level,
Or it will be green, which operates at a very low fan speed.
So far, I have not seen the intermediate state (orange).
In relation to the money I spent, I could say that I am satisfied, as I have experimented with lower value (80 euros) air purifiers/ionizers and they have absolutely no results.

I cannot know if it works, but as for its functions, it's a mess. Starting from the user manual, which is extremely inadequate. It doesn't explain anything to you. It doesn't mention anywhere what the ion function is (yes, I have to go Google it, to find out). When it goes into night mode and works quietly, there is no way to bring it back to normal mode unless you turn on the lights to make it think it's daytime. It doesn't mention when you should change the filter. It doesn't have a decent base or wheels, so you have to lift it to move it because if you drag it, it makes a terrifying horror movie sound. Inventor, let's say a Greek company with a festive ionizer, this specific one. Let them call me if they feel offended, and I will explain it to them.

It does what it promises, it is quite silent at low speed, it produces a sufficient amount of air in the next levels, resulting in quickly refreshing the air in the room. Locking buttons and disabling the indicator lights in the dark are nice additions. Occasional use.
I also have the problem with the smell, not from the first day but gradually, the filter smells. I believe it is due to accumulated moisture, something that is not usual. I don't know if the ionizer contributes to this (it may generate heat by evaporating the air locally, causing it to remain in the filter, especially if you close it, meaning the air does not circulate continuously to dry it), I'm just guessing.
The result is that the filter has worked a little, it still looks clean, but it smells and needs to be replaced with a new one before the designated time, increasing the cost.
I will change the filter and operate it without the ionizer to see if it improves.
edit:
After some time, it was used more intensively. As long as it works for several hours, there is no smell. When you close it and use it again, the smell appears. It goes away after hours of operation. Something that does not happen with a similar Winix.
It is more economical in consumption in all fan levels compared to a similar Winix.

I bought the cleaner about 3 weeks ago. From the beginning, it emitted a smell like sourness. The dealership told me that it was possibly the smell of the room, which was not the case because it emitted the same smell in every room. I also have another cleaner from a different company that does not have this problem. Then they told me it was the smell of the filter and that it would go away after it had been running for some time. So I used it for many hours in certain rooms, leaving it on only because its smell made the space unbearable without continuous ventilation. Afterwards, I sent it to the dealership, which sent it back to me stating that the service had changed the filter. Unfortunately, the same "sourness" smell remains whenever the cleaner is in operation.