i received this product free in exchange for an honest review. I have used the Medium Room Air Purifier for about a week, non-stop. Our house was plagued with an odd smell from the previous owners. After many years of trying to mask it with air fresheners and carpet cleaning, we decided to give an air purifier a try. We placed it in a front living room, near the front door, where the scent was most noticeable. I have to say, after a week of non-stop purifying, the smell is greatly diminished! Our house is large and this is a medium room size, but it seems to work pretty good! Just plug in and go. The touch controls on the unit aren't that intuitive, but a quick look at the instruction booklet which was included helped. It's a little noisier than I hoped, but you get used to the "white" noise.