I have nothing against aftermarket cables. Some of them are great, but most just don't work well with the ES5. Sure, they worked for other CIEMs such as the JHs, but just not the ES5. I think this is the point that GG and some of us are making.
It is easy to be convinced that a USD300~500 aftermarket cable, some made of silver (and of course the prestige that comes after that name), will bring positive SQ benefits. I had my twag before I even received the ES5 back then. I immediately started used the ES5 with the twag. I believed that the stock cable was junk. The twag seems to bring out all the 'details' and I found the stock cable to sound muddy in comparison. Further, the Twag cost me USD300+ and the stock is just less than USD50 and is so thin and looks cheap. How can the twag ever be worse?
It was only after I became much more acquainted with the ES5 that I find twag, as well as many other aftermarket cables I bought subsequently, are actually doing more detriments than positives to the sound.
We are all after SQ, if not we won't dump such monies into getting the ES5. A westone ES2 would suffice for bringing to us the noise isolation and comfort the ES5 would bring.
Of course, nobody is stopping you from using aftermarket cables. We are just sharing our experiences with everyone around as well as the mistakes we made along our way.