When first opening and setting up the device, it was pretty easy and straight forward.  It took less than 5 minutes to set up and the instruction booklet was concise and explained some important things about procedures when operating.  The warranty period is pretty substantial which gives good piece of mind.  Registering the product online was pretty easy and took less than 5 minutes. It is very quiet even on its max setting which seems to work pretty hard.  We just recently got a cat which I am allergic to and it is already clear the device is helping clean up the allergens in the air. Since getting the device over a month ago, it has noticably helped when turned on.