Penon recently sent me one of their Renata cables, and pairing it with the XE6s has yielded extremely positive initial impressions.
It's always fascinated me how the more substantial cables are able to alter our perception of soundstage dimensions, stretching them outwards or bending them more sharply around heads in a manner that's difficult to put into words. Among other changes I notice this with the Renata, creating the uncanny feeling that the stage has broadened and deepened which gives instruments more room to breathe in their own individual pockets of space.
There's also a lot to be said for the ergonomics of thicker 2 wire cables versus the usual 8 wire cables that've dominated the upper end of the market - less propensity to tangle and more rounded earhooks, yet potentially similar performance benefits. Maybe that's why we've seen more chunky 2 wire cables pop up lately.
I aim to evaluate the Renata side-by-side with Penon's ASOS+, EA's Code 24 & Liquid Links Venom in an upcoming review.