They are both ridiculously microphonic. I wish they'd find a way to better shield it. The price merits it, in my opinion.
In respect of the upgraded gold/silver (not stock gold/silver) and the stock silver, the difference is pretty obvious in my opinion (though maybe not night and day whereby one feels like they are listening to something totally different). The immediate two differences for me are the bass and the timbre of instruments. Though the latter may be more subtle for some. Overall, the refinement is all round in every area.
What synch strap on the cable?!
It should also be on your original cable cravenz..... Even your IE8s should have one. Where you are able to slide the piece up and down. You slide it up to make to tighten the cable around your ears and below your chin.