Reading all the comments on this site I was hesitant ordering a watch made by ZF. Trouble is, if you like IWC it's hard to pass them up. As I also heard some good stories, I took the plunch and order a IW500912.
I have to say that I am quite happy with my watch (2-3 months regular use).
Have I been lucky? Not sure.
Will I order a ZF again? Not sure, as the stories of others do fear me.
Would I order more IWC if ZF had their act together. Absolutely. There are probably 3-4 IWC's I would like to add to my rotation.
So ZF is missing out on watch sales that is 100% sure.
And the only way to address the QC issue is for them to get word of this through our TDs and then hopefully they take notice. As in the end they are in the business of selling replica watches.
What is the purpose of making a very good looking replica, and then dropping the ball on the assembly part.
So my advice is for all is to address your ZF quality issues with your TD and hope they get their act together.