I ordered the Flex because my wife had bought one for her office and it had worked so well for her. The order process was professional, friendly and efficient and I received the purifier in just a couple days. It has been as expected, just right. It is so quiet and efficient. Sleep is easy with it running in the same room. The night light can be turned off and the low speeds are so quiet, I can hardly tell it is running. I live in an old house and in just a few weeks the reduction of dust and junk in the air is noticeable and greatly appreciated. If the smoke from wildfires comes back next year, I'm sure the Flex will keep my house air purified. I am very happy with the Flex and would recommend Alen purifiers to anyone looking for the best.