
Coway
Airmega AP-1512HH Mighty
Durable, effective for allergens/odors, but loud on high.

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I have two Bissell air 320's because I wanted something that looks decent and also perfoms well. One I have had for about 6 years now. Both run 24/7 on auto mode and it works pretty good. One sits between my living room and kitchen near one of the pillars. The other sits in the master bedroom next to the door. Since we don't have a vent in the kitchen, the one between the kitchen and living room helps and will ramp up if it detects anything like cooking bacon or when I bring in things from the outside smoker. So far I have never had an issue with them and filters have been easy to get. When I change the filters, I vacuum the fabric pre filter and also clean the sensor port on the side.
We have a bissel air 320 and it makes a huge difference with cooking smoke, or when we light the fireplace and get a little smoke while the draft is forming. I'm of the same question... What makes this worth $100 (or the $260 current price) A fan....not worth $100. A silent fan? Would be worth $100 (we pay that for a ceiling fan). A silent HEPA filter and good fan... Easily worth $200... Add a space heater to that... I could go to $280. But it would have to be very quiet and a good HEPA filter and I don't think it's either of those things.
You should buy an air purifier / air cleaner with a HEPA filter. I use a Bissell Air 320 and run it on low 24/7. I replace the 2 inside filters every 6 months. I've had the unit for approximately 5 years. It cuts down on dust particles, pet dander, airborne allergens and odors. I notice very light dust accumulation after about 30 days or so. Only then do I dust my home. I also change my furnace filters frequently. Hope this helps.
End of reviews

Coway
Airmega AP-1512HH Mighty
Durable, effective for allergens/odors, but loud on high.

Levoit
Vital 200S-P
Smart, effective dust/odor; some find replacement filters pricey.

Winix
5500-2
Budget king, durable; poor VOC removal, Plasmawave disliked.

Coway
Airmega Mighty
Durable, great for allergies/dust, responsive auto-fan.

Winix
5510 & 5520
Good value, durable, effective for pets; carbon filter issues.

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Coway - Airmega AP-1512HH Mighty