I purchased this unit in 2020 for all the reasons above (quiet, easy to clean).  It runs all night on low (my choice for low) and there has been no fear of it running dry.  I could probably get two nights out of one fill, for peace of mind, I fill it every morning.  It is very easy to clean, just be sure to not get water/moisture in the vent.  In my opinion this machine is a gem and I definitely would purchase again.