I actually don’t have allergies or asthma but wanted clean air in my home since I live in a major city and rarely open the windows. I did a great deal of research about air purifiers and the different choices on the market. I bought 2 Breathesmart 45is during the recent sales. The design is beautiful. It looks like an Apple product. Very easy set-up. Instructions were clear. It’s so quiet at lower settings that I checked a few times if it was working. The high settings remind me of my tower fan. Not bothersome at all. Auto setting is great. The possibility of WiFi feature in the future was also a selling point for me. I’m so pleased with these air purifiers. I plan to order the T500 tonight for my guest bedroom.