Compact size of winix 5500-2 review is an advantage. The allergy to flying dust in the room has noticeably decreased, I sneezed constantly, now I do not. Previously I dusted everything twice a week, now I do it once in 10 days. Easy filter replacement. I vacuumed it, washed, dried, collected everything and it was ready for work again. Of course there are some extra filters. So you can safely use 1-1.5 years, and not change them once every half a year as other manufacturers advise.