This machine not only looks great but it is so quiet you don't even know it is running.  Love ability to view app and see how good my air quality is especially now in the height of allergy season.  The 5 Stars is for the machine design and performance.  But feel I must share that while set-up of the machine also deserves 5 stars, "pairing" the machine took multiple attempts.  I've had the same issue with my other Dyson machines and while I know you'll likely say it's a weak signal on my side, I can assure you it is not.  I work in the tech industry and having a strong network on my end is vital. So just be warned that you'll need patience in getting the machine paired and that is the only "downside" I can find or point out with this machine!