Well, I have about 15 minutes on my new Silver USB cable from Xangsang, the 9003 cable. I received it from China in less than 10 days. I bought it so I can use 2 DAC's. My current cable is a Wire World Starlight Platinum that I absolutely love. The Xangsang is supposed to sound like the WW. It did not disappoint. It sounds so similar. It is a little smoother and just a bit laid back in comparison but the sound is close. For $100 it was well worth the money compared to $600 for the WW. Hopefully it becomes a little more alive as my system warms up. My Mark Levinson integrated takes about 45 minutes to sound its best.
As far as cable break in is concerned I am on the fence about that as I haven't heard those changes with cables yet.
I will report back if I hear any changes.
By the way, this cable is heavy and built like a tank. No cheap parts that I can see.
Ok, after listening a little more, the cable gives me about 90% of the WW Platinum. It is slightly warmer and more liquid or smoother. It has a little less detail but tames sibilants a little better. Like the WW, there is no grain or roughness.