The Prolux CA2000 is a good quality air purifier. I have hesitated to buy a purifier for a while because I was always worried that they would be too loud, but this unit is very quiet. Even on its highest setting its still quiet, and moves a lot of air which is exactly what I wanted. I have noticed a big difference in the air quality, as I have allergies, and a dog. This thing is great, and I would definitely recommend this purifier.
I've been very pleased with this product. I like all of the options (silent, auto, timer, tells you when the filter needs to be cleaned). I can smell a difference in the air quality and also feel a difference in my chest/breathing. I can tuck it in a corner easily and in silent mode, no one knows it's working its magic.
First unit arrived and had a "chugging" sound in the motor. I was disappointed as I really love the clean design and very simple access to the prefilter, charcoal filter and hepa filter. I have had other units that required unscrewing components to change the hepa filter. I contacted customer service and the 2nd unit they shipped is very quiet--no chugging like a train trying to go uphill. Very pleased.
I have a really hard time sleeping with any noise, a heater turning on wakes me up so I figured this would be something I turned off at night. It has 3 different speed settings and silent mode is so quite I don't notice which is amazing. I have this thing running almost 24/7. The charcoal filter works well for smells and I see the fur/dust that collects on the filter. Unit is small and powerful, easy to move around.