I have a levoit 300S HEPA air purifier. I'd never heard of the brand before I bought it, sounded fake, but my allergies were getting unbearable and $100 for anything truly HEPA is neither exorbitant nor suspiciously cheap. I've only had it a few months, so this isn't a true BIFL recommendation, but I'm very impressed with the build quality; parts fit together very precisely, feels heavy and sturdy, and the fan continues to spin for a long time after powering it off, indicating that it's very well lubricated and balanced. It feels like a much more expensive product. Also has a fair amount of settings including one to turn the LEDs off. After the first few hours of using it my bedroom smelled a lot cleaner and the air felt different to breathe, reminded me of a very clean hotel or hospital. The company recommends replacing the filter every nine months, I think they could probably last a year if you periodically wipe down the outer mesh of the filter with a dry cloth to remove the layer of larger dust particles which isn't touching the HEPA filter. Supposedly works with an app as well but it's not required and I never used it.