My experience with Vivosun...
Less than 2 months in, the filter was totally clogged and needed to be replaced. I attribute that to my humidifier putting out dust, however, their pre-filter is junk and let's too much through. My new filter (another brand) is considerably better.
3.5 months in, the motor started to make a wobbling and squeeling sound. Had to keep it running because I couldn't shut it down. The other day I emailed them and they sent a replacement no questions asked. Good customer service.
Replacement (can you spot the problem?)
So, not sure I'll be buying their brand again. I suppose it depends on the response I get today on the replacement. Good customer service but quality?