Posted 02 January 2018 - 02:06 AM
I don't want to seem facetious, but that is one of the things about them that will be unknown. Major brands have a track record, unheard of brands will be an unknown quantity. With that said, they mostly come from a few big factories in China, and are just re-badged versions of a product that may appear under several names.
Overall, with highly automated design and manufacture there are less really poor products produced than used to be the case in the past. But to sell much cheaper, use of lower cost components leads us to expect shorter lifespan and more likelihood of faults than premium brands. You will probably find they use lower grade panels, so be more likely to show some aberration like uneven illumination or pixel faults, and there will probably be no support like spare parts available if there is a fault.
A Google search may show if a brand name has sufficient sales to register complaints or recommendations, and finding out who they are imported or supported by can be helpful. Having a long warranty can be a consideration if they are backed by a business that will be around to provide that warranty. It's probably also more desirable to actually see the monitor in operation, in case it has poor image quality etc.
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