Had a Quadra for about a week now, and have noticed a dramatic reduction in dust in my house.   True, the ozone smell is prevelant, but we all have gotten used to it...the smell isn't "bad", just different.  Almost an artificial fresh.  My wife and I have experienced a lot less morning congestion and easier breathing.  Neither of us have respiratory distresses such as asthma, but in Florida, the pollen and mold can really get to you at times of the year.  It is still early in our ownership, but I can honestly say that there is a marked difference in our air quality.  *Note*  We have one...