Imma be honest, I've had a lot of unreliable bad air purifiers for my house. At first, I had many doubts of the reviews of this Blue Pure 511i Max, but after one month of using this purifier, I have to say this right here, IS THE BEST CHOICE for cleaner air for your home! I currently have 2 for my living room and for my personal room, and I must say I always walk into my home with cleaner, fresher air!! This goes above and beyond my expectations for air purifiers and I will ensure I stay a loyal customer, Blueair!!