Air purifier #2 works perfectly so far.
Noise level: Definitely wayyyyy quieter than failure of a unit#1. On sleep mode, indeed very quiet. I easily fall asleep with it on.
Sleep mode: awesome! So quiet and the dim light is great as a gentle on the eyes night light. Can also turn the light band off completely in sleep mode but still get a little blue glow from the button being lit up.
Timer mode: convenient for if you smoked or cooked in the room and just want to leave if running to clean the air a bit while you leave. You can put sleep mode on timer mode but it'd be helpful to set the timer first before turning off the light or else you won't see which time setting is illuminated.
Air quality indicator: Really works! At first, it'll start off on high speed as it tests your air, then if it stays or turns blue, your air is good and the fan speed lowers (you can change the fan speed yourself too). First run out of the box, light indicated red as it started out testing the air. Quickly turned yellow then blue. A little while later, I had shook out a blanket close to the unit and it turned yellow and increased fan speed for a few minutes! I'm sure there must have been a small amount of dust or dander or something in my blanket and the purifier picked up on it.
Aroma therapy bonus: I appreciate that it can also diffuse essential oils. I like to use lavender oil on sleep mode. They include an extra aroma diffuser box plus the one already in the machine. Would've liked one more. Directions say to not mix scents so I guess I'm stuck with lavender in the one diffuser box forever and whatever I pick for the extra diffuser. Will have to find more somehow if I want more aroma options.
5 stars because it is everything it was advertised to be.
Things I wish could be different:
-one more essential oil box
-option to turn off the air quality indicator light band without it going into sleep mode and dropping the fan speed