Bests & Worsts Reviews from Amazon

This product worked great for two years. I didn't see the dramatic results in dust reduction others have reported, but it does work well in sensing and destroying odors in the air. However, after a couple of years when the unit switches to lower speeds there is a horrible noise that gets on your nerves after a few minutes. If I would have known after two years this would happen, I would have definitely saved $$$ and gone with another, less-expensive option. **UPDATE** 04-11-16 - I reached out to Alen customer service by both email and phone asking about my now unusable fan. I haven't even gotten a response from the customer service team. I would NOT recommend this company.