I’ve owned an air purifier by another maker for a long time.  It finally dead and I went about 2 years without a purifier.  I noticed the different of not having purified air.  After doing the research, A Dyson was the one I wanted, but the PRICE!!!  After 6 months I finally made the jump, and I’m very glad I did!!  This unit is great, and it actually does a better job at purifying the air than my old one.   But the best feature for me is the Wi-Fi connection.  It allows me to control the unit when I’m not at home, which is a GREAT feature.  I’ve had the unit for three months and I’m sleeping better and not waking up with a stuffy nose.   I would have to give it a 10/10, just which the price was a little more affordable.