Summary: The Honeywell's long-lasting HEPA filter should be vacuumed twice a year, but Sherbenou says it will eventually have to be replaced. The Honeywell also uses an odor-reducing carbon prefilter (Est. $15) that should be replaced every three months. This is one of the least expensive air purifiers available, but it doesn't have the power to filter larger spaces.
Pros: Good dust/pollen/smoke removal, Permanent HEPA filter
Cons: Small coverage area, Noisy on high speed, Not Energy Star-qualified