[jfim]

Keep in mind air purifiers are just a fan with filters in front of it. A box fan with a furnace filter strapped to it, while ugly, will do similarly for reducing the amount of particles in the room.

What you're paying for is basically three things: a design that looks acceptable in a room, a fan that's reasonably quiet, and ability to source filters in the future.

[rkagerer]

Check, check and check. And also a filter quality and seal design that's been tested and proven to work (they do a QA particulate test on each individual unit before it ships https://imgur.com/a/exTrjU7).

[nextos]

IQAir are really good. My only complaint is that they are expensive and that their fan uses too much energy.

I wish they would release a smaller machine that was a bit cheaper and could compete in price and energy usage with mid-sized Coway models.