Seems to me to be a lot of equipment snobbery going on here.
Lots of major manufacturers have their products made in China not just microscopes and this has been the case for many years now.
I was advised to check my Sony camera was made in Japan and not China when I bought it 5 Years ago for 650 Euro (still going strong). It was of course manufactured in China is still manufactured today and sells for 350 euro. The latest variation is now up to MK5.
Don't mistake a qualified opinion for an opinion, Roldorf. Yes, China is perfectly capable of manufacturing a piece of equipment made to whatever specification that is required, within the technical realm of their society. A Sony camera for 650.00 Euros, because Sony put the possibility on a platter for them, or the equipment to land on the other side of the moon. If a camera claimed similar specifications as your Sony but just happened to be called a Seagull , was 1/2 the price and only available on the internet would you have considered it in the same breath as your Sony?
The key point is the term "whatever specification that is required". In the case of the majority of internet hawked Chinese microscopes, those specifications are quite mediocre, with some they are unwilling to reveal, concealed and some others that are completely ubiquitous, overinflated by hyperbolae. It is usually the price that attracts the new buyer, that and fear of the unknown that a used quality brand might bring.
Like with everything else, consumers who don't really know anything about what they are buying are very vulnerable to marketing strategy and afraid that they are going to get taken, if they buy something used. That is always possible, so asking questions and relying on advice from a place like this forum can help. Getting taken dosn't just exist at the used goods level though. It happens all the time with new goods . Cheap is cheap. You get what you pay for.