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I don't know man I'm going to play the devil advocate on this. I bought some parts of of ebay before that were knock off and put them on my z and had no problems with them. I will say if something is a knock off and the price is to good to be true it probably isn't worth nothing. You just have to use your better judgment in the end. I would buy some things knock off that i know are just as good as the real deal (i.e. pipes, headers, etc) than buying a knock off ecu. Like i said use your better judgment. Look at the welds in the pictures etc. I know that not everyone has ARC or Bride or whatever JDM part prices out there. Once again just use your better judgment.
Also just remember the longer the Z is out, the cheaper it gets. The are getting their hands on them and they will look for the cheapest ebay items to put on them such as this crap. It will just continue to go downhill.