Love the settings on this machine. It has a day setting, so you could hear it, then a night setting, so it's quite. I've been leaving it here, so that I don't have to listen to it. Always works, no matter what happens to it. It also looks nice, so it fits in with almost any decor. Ease of Maintenance It's fairly easy to take care of. Pop out the filter, pop a new one in. I have also been cleaning mine off& reusing it. Seems to still be working just fine that way, also. Dust/Allergen Removal I had allergy symptoms for about a month after we first got it. Guess it was clearing out the air. I've had next to no symptoms every since! Filter Availability Not quite certain where to find the filters at. Durability The cats knocked it off the table a couple of times when I put it up to clean the carpet. It still works great, & never seemed to be broken. Effectiveness Have had clear air since we first started using it. Design Small enough to fit just about anywhere. Love the quiet mode. I can't hear it unless I listen for it.