I spend a lot of time on a forum for a great 3D printer kit that doesn't come with a 12V power supply. People are always searching out the cheapest 12V 30A MeanWell knock-off that they can. I'm sure there's countless different manufacturers of these power supplies, but from what I've seen, they're certainly a crap-shoot. They end up working fine for some, but others complain about the fan going bad, or the power supply giving up after a few days to a few weeks of operation. I'm sure they're not able to withstand the full rated load that people assume they can draw, or on a 3D printer, the heat bed cycling on and off. That'll continually and instantly be swinging the power supply from low-load to full-load.
On the plus side, over the two years I've supported that forum, no one has ever reported a failed power supply that also took out whatever was connected to it.