Airfree P60 Air Purifier

I have heard about these air purifiers that can supposidly wipe out pollen, dander, mould and other spores in a room if left on permanently. They heat up to high temps rather than have a removable Hepa filter.

They are quite expensive but as my 2yr old is struggling despite his becotide and ventolin (due to pollen I suspect) I wondered whether we should invest in one for his room.

Has anyone else tried one and did they have any luck or should we save or money?

Your thoughs would be appreciated.

Jane