Not BIFL but we have a Shark air purifier max and it is awesome. My wife has pet allergies and we have 4 cats and a large furry dog. We have the max in the living room and the smaller one in the bedroom. If the power goes out in the middle of the night and they aren’t on, we can tell a difference in the morning. With our super “dirty” air we still only change the filter once every 7/8 months.