I bought my Holmes Air Purifier a little over a year ago and it is still working as good as it did the first day I got it. The reason I got it was because my allergies were getting bad and it worked great on cleaning the air of the harmful allergens. Also, the filter is easy to clean, just pop off the front and there you go. I usually just rinse it out really good with water. There is also a little thing inbetween the two knobs that help you keep track of what month you cleaned it. Since I liked it so much not long after I bought the first one I went back to the store and purchased a second one. I love this product and hope you do too!