Because MCGS is so popular, counterfeit or grey-market units exist. Here is how to use the "hot" listings to your advantage without getting burned.
Users sometimes face "-8" or "-5" communication errors, indicating data tag limits or serial port conflicts. 4. Summary of the MCGS Success Chinese MCGS HMI on old used equipment - PLCTalk.net mcgs hmi website hot
"Don't pay per tag. MCGS HMI includes 10,000 internal tags in base price." Because MCGS is so popular, counterfeit or grey-market