Guido, usually shielded power cords in combination with power conditioners or re-generators work very well with units utilizing switching power supplies.
Your X-01 Ltd has a dual R-Core linear power supply which, in my experience, works best without any power conditioning or re-generators (the X-01 and UX-1 have a built in EMI filter) and the use of un-shielded and, preferably, un-twisted power cords made of pure Silver.
As far as the Shunyata PC goes, may be Earflappin can give his summary since he has been using these extensively.
Hey, when are you going to visit? Any time soon? :-)
Regards,
Alex