Efficient and downright cute! I wasn't aware how well our Evachill was filtering our air until we replaced our filter after 6 months. HOLY MOLY. 

I bought one for my husband, who now snores considerably less (thank heavens!!), my mom-in-law who says she no longer wakes up with sinus headaches, and my brother-in-law (for his upcoming birthday). You have 3 rave reviews from this family alone. Thank you! Oh, and customer service is crazy fast and helpful. 

(I also have a picture of the old filter if you want to post this review.)