I have spent years, both summer and winter, by waking at 3am and then spending an hour trying to get back to sleep with an instant blocked sinuses. First night turning this on, no waking and no sneezing in the morning. Even when I woke, my sinuses were clear.
Very simple to use, turn it on, set the speed, turn off the light (otherwise its quite bright) and get ready for bed. The Sleep mode is extra quiet, but if you are used to an air-conditioned or any noise, even on setting 2 will not be any problem.
So glad for this purchase, and hoping that the filters will last me more than 12 months.