I have been so happy with this air purifier! It is exactly what I was hoping for when I bought it for my son's room. Since we have a dog, I wanted to be sure that the air could be as clean as possible where my child sleeps. This air purifier does a really great job of keeping the air nice and clear, even in a larger room. Ease of Maintenance I've had no trouble taking care of this air purifier whenever any issues crop up (of which there have been very few). I'm really happy with how easy it is to maintain. Dust/Allergen Removal I have been very happy with the way that this has kept the air in my son's room clear. Our dog tends to shed a lot and there's always a lot of dander, and this purifier does a really good job of keeping the air clean despite this. Filter Availability I have only had trouble a couple of times finding filters for this purifier. Durability It has held up great for over a year of daily use. Effectiveness This does a wonderful job of filtering the air. Design I like that this is compact enough to fit in the corner and not take up too much space.