Yeah it's why I qualified it with the "too good to be true" prices and names you don't recognise. The odds are far greater that a brand name you've never heard of undercutting at more than half the price of a brand you do recognise is very likely cutting corners somewhere and stamping invalid certifications. With electronics that can end pretty badly.
Not writing off all Chinese companies. Just the ones that have a new name every month and are selling at too good to be true prices. I think they're suffering the same as Japanese electronics did in the 80s. There were enough bad examples to make people assume it was the same for all (you'll see it in movies of the era, with people referring to "jap-crap"). But as we know, some very big companies today rose from that situation to be extremely trusted today. I suspect over time the same will be true in China.