gdhal:
I base my comments on listening. (Are you an electrical engineer? I ask because the one's I've met who happen to be audiophiles don't believe in anything that cannot be measured).
By the way, BJC doesn't believe that burn-in makes a difference either. These things most likely are true with their cables. (I tried their cables in both directions, theirs did not make a difference here. Others I have do and the manufacturer specifies this as well. Regarding burn-in of BJC, I did notice a lack of grain after about 1 & 1/2 hours).
When I bought my latest tt, VPI Classic 3 SE Sig, I felt the need to kind of start over with evaluating cables in my system. I started with the BJC. I wired my entire system with it. While it was acceptable, I found them lacking in transparency, openness etc...
I then began inserting my other well heard cables into the mix just on my front end. The positive sonic differences were easily heard. One great example of this is my Morrow Audio PH-6. It sounds horrible in the opposite direction than what is recommended by Morrow. Another... I bought a new Shunyata Taipan power cord years ago, the dealer said it would take 300 hours to break in... he was right on the money!
Listening is truth.