I’ve had another purifier for years. My allergist had this brand in the office. Just purchased this one and the first thing I noticed is how QUIET it is. I like the info panel on top to show how clean the air is. I like that you can turn the lights off on top when not needed. Less light in room when sleeping. I would highly recommend if you are troubled by allergies, definitely brings improved sleep, health.
In these times, I've got a housefull of air purifiers most of which are too loud to go in the quiet places, but the Alen 45i has a prominent place in my music room and the Alen 75i in the living room. They are powerful, quiet, and provide an extra layer of protection to our vaccinated and masked guests.