I love this machine. Nice size that gets all the square footage in my house. I feel like it is helping I was sneezing all the time. Not sure why I guess because there was allergens in my house. Even though vacuum 2 times a week. Need to really deep clean to get all of it. The only thing is its a big filter. But says it lasts almost a year. So that's good. Never had anything like this before. I love gadgets so this is right up my alley so to speak. Shark you've out done yourself.