Saintkeat,
Just as with anything else there are good and bad outcomes. I have had excellent communications with Andre as have most of the posters here in this thread. There are so many variables in the construction of customs that I think that we've all been rather lucky in the overall quality of our customs. Andre is simply a salesman. He entices us to buy and then he places an order with the labs at Fisher. Ultimately, he has little or no control on the QA process.
When we email him he then has to investigate with several people in the lab to track down an equitable resolution to the problem. Most often we are left returning our customs for a re-do as sucky as that can be, especially for international customers.
Personally I cannot speak on Andre's responses or lack thereof, as Andre and I are not as "Tight" as it may seem. I was simply one of the first customers back in Sept. 08, before the recent madd rush and develope a good reporte with Andre. but I can say that from my personal experience, The C/S at HY/AE has been excelent. Keep trying.... I'm sure Andre will make it right for you. I know it's hard to be patient, but I can say that my C-3's are still my go to cans. Full sized or IEM's.