I love mine, and I never thought they would make that much of a difference. Best cables I've heard (although I haven't done anywhere near the quantity of cable comparisons the regulars here at AN have
For me demo'ing a whole set really did it. 2 pair SC3 IC's, 1pair SC3 speaker cables, AC+ PC, 2 AC+ digital cables, and a nice bargain Ultra conductor II IC for the preamp to sub amp connection.
Can't comment much on break in, they were excellent right from the start.
Rob S.