Comment by nextos

Yes, assessing devices is far from trivial. In case of air purifier reviews, there's little focus on two crucial elements:

* Real energy consumption and performance when the filter is a bit dirty

* Fan noise and vibrations when the device has already been in use for a year or two

For example, in my experience, the top pick from Wirecutter (Coway) excels on the first item but fans tens to become misaligned after a while and vibrate a lot at low speeds. It happened to 2/2 units I bought.