So far I give it a 5 star. It was delivered next day. The size is good not to big but not too small that I feel it’s not working. In the instructions it says to put it on fan speed 3 for 20minutes so it can do a quick clean then lower it to speed 1. As soon as I turned it on it smelled like plastic but then it went away after a couple of minutes. I put my flashlight against it to see if it was working and it was, I could see all the particles in the air going into the machine. I made a video with the three sound speeds. I feel like you could do 3 for 30-45 minutes then put it back down to 1.