If you are asking has anyone compared them I have. I had a Nordost demo case with blue havens through the frey. I would say with each step up the brightness is somewhat tamed - the air between the vocals and instruments gets a little better and the timber gets a little better. I did get the freys in the end. That being said I will admit it was more of a speaker cable comparison than ic's for me. I personally did not care for the Nordost ic's in my system (I prefer my fusion audio interlocker ic's and pc's).
