This air purifier works wonders especially for those with indoor and pet allergies. My husband and I purchased this air purifier after we were first married. I had two cats which he was allergic to and he also had other indoor allergies. He had terrible allergy symptoms including terrible nasal congestion and he snored terribly at night due to being congested. An hour after we first plugged this air purifier in, he noticed a difference. This really did work to clean the air in our home. A huge plus is that this air purifier is on rollers and can easily be moved from room to room. We would wheel it all around the house. Just with the air purifier on alone he experienced relief from his allergies. This air purifier is quiet and even though it takes up some room, it is attractive. Dust/Allergen Removal This air purifier works wonders at removing dust and pet dander from the air. We also lived in Los Angeles when we purchased this and the air in L.A. is not the cleanest. I noticed an immediate change in the quality of the air in our home after using this air purifier. Filter Availability This filter is very easy to find online. It lasts for years so only purchase one at a time. Durability This is a very durable air purifier. It is built to last and is very sturdy. It also comes on wheels so it can easily be moved. Effectiveness This air purifier is extremely effective at cleaning the air in large rooms. I noticed a change in the quality of the air in our home after an hour of use. My husband, who has terrible allergies, also noticed a change and as a result has less allergy symptoms.