How many ways can I say how much I love this Shark HP202 Air Purifier? Too many to list!  It works perfectly. I have a husband who frequently has bouts of allergy attacks and this unit has been such a relief for him. It is quiet and inconspicuous and works with a remote. I love that it shows you when it is "working". When outside air is introduced (window or door is opened) the unit's display shows you how it fixes it. The best part is that once it is set up there is no need to "fiddle" with it. It knows it's job and does it with little interference. I would highly recommend it.