I bought this unit a few weeks ago. Last Sunday night our neighbor's house caught on fire and was destroyed. We had a very heavy smoke smell in our house from the fire. We had two of these Blueair machines. They ran full blast for about 45 minutes and then dropped down to the low setting. I was very impressed with how quickly they handled the fire smell.  We can not smell any smoke smell even though there is a burnt house less than 20 feet from ours.
Aside from the fire this unit handles the smell of multiple pets and a dusty environment. I would definitely buy this again.