Hello Lubos,
I found the Valhalla I.C. S.C. and P.C. to be addictive in my system. The highs are so open and airy with no hardness or forwardness whatsoever. The bottom end is more detailed and extends lower then my previous Cardas GR without the slight mid-bass bloat of the CGR. This added mid-bass bloat gives a sense of a fuller mid-range that actually obscures detail in the lower mids and in the upper bass IMO. I believe this lack of mid-bass bloat is why some people pass on the Valhalla. The mids I find to be dead on.
As of yet I haven't heard this level of speed, neutrality, or detail from other cables. This real information gives me more insight to the phrasing, subtle dynamic shifts, and texture of tone of the instruments being played on the recording.
It might also help you to know I'm using the EMM DAC6se and CDSDse for my front-end and the speakers are Avalon Eidolon Diamonds
Whatever you decide I wish you all the best,
Tom