I've got one
I would actually say, do get one
It's not reducing the temperature that much, but it's improving the air quality. I was away, walked into the flat yesterday and started coughing within about 10 minutes.
Then I put that on. It helps. You do have to sit right next to it.
Then later, I switch it off and go outside because by the time the Sun hits the flat, it isn't worth running it because it's competing with too much heat if that makes sense
In a new build, it's in use from May to October. I say this as somebody who is permanently wearing four layers in winter. I really feel the cold. But it's more about improving the air quality.