Cheap can mean many things but usually it means lower performance, particularly if they omit a DRAM cache, and could also mean counterfeit or false capacity rating.
Recognize that flash chips are a large part of the construction cost and a highly sought after global commodity and shouldn't be cheaper in China, unlike many things. A good Chinese SSD would not cost enough less to be worthwhile, especially if there is no way to get warranty service from a US location.