I had decided on the Winix 5500-2 and in October of last year, when the price went down to $119, I purchased two.

I wanted one with a true HEPA filter, carbon filter, reasonably priced replacement filters or off brand options. The first filter, I regularly clean off outside, as it's reusable.

I don't need the auto mode, but find it useful, as it turns the filter on when it senses enough natural or artificial light, in the morning, and goes into sleep mode when the lights go out.

It controls odors well in my teen son's room, cooking odors, and rainy day dog smell on the rest of the first floor. My son's allergies are impressively non existent. He has a mild issue with dog dander and severe allergies. The filter has the dander under control and so far tissue and allergy med usage has dropped. We'll see how it does in the spring months as pollen count rises.