I love the Blue Pure 511! We have an air purifier in almost every room in our house. They are big, ugly and nothing to look at. The Blue Pure 511 looks like nice decor. It just blends in to the home surroundings. We have ours placed on the floor in the dining room, and I would NEVER have put another type of air purifier there. It looks great! It's quiet and easy to operate. No rows of buttons and lights -- just one button. Easy!