The Shark Never Change Air Purifier Max is a great addition to my bedroom. The air circulation in my room is great, and it smells really good with the odor neutralizer cartridge. You can purchase replacements. I LOVE that the motor is whisper silent. It won't affect my sleep. It reads the air quality levels in your room. I am so happy to have this. I am going to recommend it to a family member who has allergies. I have used it for a while before I did this review to give an accurate assessment of this system.