You can almost see & feel it clear the air.  Remember: you are instructed to spray the air ABOVE the fabrics – and it acts like a microscopic net that drops down to keep floating "enemies" down to a low roar.
I found the scent to be "just right"; and the nozzle/spray mechanisim to be VERY SUPERIOR in terms of the amout of coverage you get with only one squirt.
When I first bought this, I thought that I would have to excessively pump & spray to cover everything.  However, it only took a few pumps to cover what I felt needed to be done.
Remember that dust mites love to eat microscopic pet dander and human skin scales – all of which collect in bed fabrics & furniture.
I found an explanation of HOW it works (chemically):

http://answers.yahoo.com/question/index?qid=20080903133432AAcmfQ8

Recommended: Yes