I love this air purifier. First off, it is compact enough to fit in a tight space or closet. It also has a remote controller, allowing you to program it for the area of the home you choose to use it in. It has a simple LED read out, so you can determine the appropriate settings, and it helps eliminate toxins in the air as well. Ease of Maintenance The front grates are easy to clean with a damp cloth or towel. Filter removal is also a breeze, as the back of the device is easy to remove. Dust/Allergen Removal Helps eliminate mold, it helps remove dust in the air, it helps with ammonia smell in bathrooms, and helps reduce must in the kitchen. Regardless of the room you place this in, it helps purify the air. Filter Availability You can find replacement filters (generic), at any local home improvement store, or you can order directly through the manufacturer's site. Durability We have owned it for about 2 years, and it works the same as it did the first day we brought it home. No complaints, and extremely well built unit. Effectiveness I find it most effective in dust removal and helping filter clean air. If you have a tight space or small room, this will circulate the air, and push clean air through the entire space. Design It is a bit clunky in size, but short enough to fit in any space. And, it is small enough that you can place it under a table, desk, or in a tight corner, without getting in the way, all while purifying the room and air, in any space.