I purchased the Alen BreatheSmart 45i air purifier. I dreaded the Chicago-land winters. Over the past two winters my nose was constantly running and I was coughing, sneezing, and constantly clearing my throat when sitting in my family room. This air purifier made an immediate difference. I was able to put the tissue box away and I stopped coughing, sneezing, and clearing my throat. This air purifier is sleek and techie looking, something that was very important to me, and it was easy to set up.