Take colour for example. We got a bunch of prototypes (Packing) made and designed in China and the final result was what we were after. When they went to production, the colour that was specified was off, as they used a second provider to help meet deadlines. What occurred, when they gave them the files, they put it in their system, but the colours didnt match what was being outputted at the printer in the pantone colour system. It resulted in two batches of packaging - one that was good from the original supplier, and the second from the other supplier that was way off as the second supplier had pirated software to cut down costs and inferior printing inks. Not a big issue for small orders, but a few thousand later, it can be a very expensive outcome. Just pays to do due diligence with Chinese providers on any works over seas.Hope this helps