Been running for about 6 moths with no problems. The machine wanted a filter change at around 5 months, but I figure I probably have a more dirty environment than most. No complaints. I run it basically full speed 24/7 it's a little loud at that speed, but I'm a big fan of white noise so it doesn't bother me at all.
It’s a good purifier with UVC light. Both black and white colors are perfect. Quiet on level 1. Have a sleep mode if you don’t want too much light when sleeping. It automatically changed the airflow if you turn its automatic setting. The more polluted the air, the higher the level the fan will be.
Initially I wasn't sure if my filter really was doing much. But when work was being done inside our house that involved a lot of particles being thrown in the air, I was relieved when the color on our filter finally changed letting us know the air quality was not the best. So it let me know it truly does sense the quality of the air. Once I ran it on high with the special features it cleaned things right up and changed back to a blue light. So we're happy to know it's helpful!