They had an article in Home Shop Machinist years ago spelling out the differences in the the Asian machines from different suppliers. The author actually was a buyer and toured most of the plants where they were produced.
All the plants worked from the same basic prints, but the manufacturing methods and quality control varied from plant to plant.
The article even had photos of stripped down milling machines and lathes showing the differences and the modifications needed to correct deficiencies.
His conclusion was to pay a little extra for a machine from a reliable supplier such as Jet which is what I did when I bought my 9X20 lathe about 15 years ago.
