This air filtration system is fantastic!  We had a Shark system before and loved it but this one is even better!  I love that we don't have to change filters!  That makes all the difference!  Never having to buy or change filters is a game changer for us!  The other thing we love is that it has an automatic air quality sensor so that when your air quality gets worse, the fan speed automatically increases!  You don't have to manually turn it up!  We love this feature!  We are enjoying this air purifier a lot already!