Expensive product, but so far it's been worth it. I immediately felt relief from my allergies. I no longer cough and sneeze all day and my eyes have stopped watering. I also like that is helps keep the room cool. 
 
My only reason for giving it four stars instead of five is because it claims to cover an 1100 sq ft area, which I believe is exaggerated. My entire house is only just under 1400 sq ft, the living room/dining room combo it's in cannot be more than 700 sq ft and the system indicator rarely turns blue even though it runs 24 hours a day. If it were really that effective, I would think that it would remain blue at least throughout the night. But every time I wake up at night, I glance and it's almost always orange. I am an extremely clean person and vacuum daily, so why wouldn't it be blue? 
 
I just hope the motor can handle running 24 hours a day. Only time will tell as I've only owned it for about six weeks.