It arrived on time, ez set up, pull out of the box and plug in, Instructions simple to understand.  It is very quiet - on low  you don’t hear it at all.  After a few hours, I noticed the room did smell “cleaner”.  We live in Yuma, very dusty and it “smells” dusty.  So far I am very pleased with this product, but have only had it 2 days.  I agree with other positive reviews and I hope to add to mine after a few weeks.