Having lifelong asthma I've been researching new purifiers for over a year. I finally decided I would make the investment on an Alen BreatheSmart FLEX HEPA. There are many others air purifiers on the market at lesser prices but I'm a believer you get what you pay for. I have been running it in my home for two weeks and have been very pleased with everything to do with it. It's ability to clean the air, the ease of use, dependability, and it's visual appearance. I am sure that I will now continue to invest in additional Alen HEPA products for other needs/areas of my home as well as family members in their homes. Thanks!