I received the air purifier for free from TryIt and set it up after it was delivered.   I had to unwrap several pieces of plastic and set up the filters.   The machine has several settings with clear picture indicators of bacteria, dust, and all the other things it can clean from the air.    It is very quiet and it does make the air feel cleaner and calmer.  I like it a lot and was impressed at how quick it helped clean particulates from the air.