The Winix 5510 air purifier is being reviewed and compared to other air purifiers on the market. Some outlets are testing and ranking multiple air purifiers, including the Winix 5510, to determine their effectiveness in reducing allergens and pet dander. The Winix 5510 is also being directly compared to other specific models, such as the Levoit EverestAir and IQAir HealthPro Plus, to help determine which one is the better choice.