I recently tried this Honeywell Insight HEPA Air Purifier and it works wonderfully.  I love how it doesn't take up too much room.  It isn't too loud.  It has touch buttons that are very easy to use and navigate through the settings.  The filters are easy to remove and replace.  And it has greatly improved the quality of air in my bedroom.  It works great to neutralize pet odors and smoke residue.  I am very satisfied with this and will recommend to all my friends.