I actually love this air purifier! I can truly tell the difference when I wake up in the morning, no more congestion or weird sore throat feeling! Plus when you put it on the medium setting or higher it sounds like a white noise machine — some may not like that, but it's super soothing when going to sleep. I leave it on low during the day to continue to purify the air. 
My only con would be trying to get the compartment open where you place the filter.