We have a Idylis Large Room Air Purifier in the office I work in. This device makes SUCH a difference in the air. The reason we chose this machine was because of the UV bacteria killing light that it features. Our office has many people coming in and out of it, including children. The UV feature was important so we could reduce the amount of bacteria for not only our employees but customers as well. The purifier is great for large open spaces. The air feels so much fresher throughout the office. There are never any odors lingering around from somebody's lunch or trash that was forgotten over the weekend. There is an indicator on the device that tells you when to change the filter. You will be shocked by how much junk is in the filter! There is a remote, which makes changing the settings extremely easy. This is a high quality and powerful air purifier. The UV feature on it kills bacteria, which is great if you have any children around. Although this device is pricey, it is worth it.