We'd really gotten used to the Levoit Air Purifier. I have a model that uses wifi and it is convenient to set schedules. Our machine made a noticeable improvement in the quality of air in our small apartment. We like a little white noise for sleep, so we set it to a fan speed that will allow us to mask some outside noises. It is pretty quiet at the lowest speed.
We leave for winter, so the unit we had for nearly two years, really only had one year of use. Then, as must be prone with a certain batch, we had problems. The machine stopped turning on. As two years were about to expire, I emailed their support team. After sending documentation including a small video showing the problem, they sent us a completely new unit. It came in less than a week via UPS.
I like clean air and the automatic function as it senses dust. It works as it comes on after I apply body powder or cook some types of foods. I cannot live without an air purifier now and I will stick with this brand simply because I feel pleased that they backed up their device with a suitable warranty.