This is my second Honeywell Hepa Filter Product. The first one lasted over 10 years, and would still work today if I hadn't lost it while taking it on a trip. This new unit is stronger--moves more air per second. It has three power levels. The highest is a bit loud, and could be difficult to sleep with. However, the medium and low levels are quiet. I use the medium setting at night, and high setting during the day (when I am at work).
I have very severe allergies and without the unit, I can't sleep. I sneeze constantly in my house. But, with the Honeywill filter, I sleep easily and don't sneeze in the house at all.
During the past two weeks, my daughter asked me to "take care of her cat for a month"---I should point out that I am allergic to cats. But, with the filter, the cat is not bothering me (whereas, I can't visit her house without having an allergy attack!--she doesn't have a Honeywill Hepa Filter). I've convinced my daughter to get one of these filters for her home too. It's a great product.