Buckingham definitely knows his VD cables. He and a few other of us were early customers of Rick's. I tried out four Power 2s about a year ago and was so impressed, I upgraded to the full cyro'd Audition Package a few months later.
For me, they took about a month for full break in. I would say within the first week you should get roughly 70% of the cable's potential. The huge, precise soundstage and excellent clarity are there immediately, but what happens over the long run is that they lose their iciness and sound much more natural once burned in.
I went through the same process when I upgraded my digital cable from Audition to Nite, and added a Nite extension cable in front of my Auditions lasy summer.
Prior to the Audition Package I was using a hodgepodge of very good cables, but could never find a scheme that was smooth yet detailed, natural yet spacious. To be honest, I'm not sure if my success is due to the Virtual Dynamics brand, a unified cable package or both. But I'm happy!