As a matter of fact, I received the Teo cables two days ago and have been trying to pin down my impressions. Ken says that the cables will continue to break in for another 80-90 hours or so before they reach their full potential, but I will say that they are already--right out of the box--truly incredible.
I cannot improve very much on what bugredmachine has already said, except to echo his observations about the almost surreal clarity of these cables, along with the sense of dimension, texture, and impact. Give me a few more days with them to be more specific, but let's just say that I have already placed my order for a second pair.
The oldest cliche in high end is that something makes all your recordings sound new and different, but that is just how this feels to me. Like recordings I have known most of my life have been remastered, revealing nuances I have never heard before. For example, I have heard Fleetwood Mac's "Rumours" about ten thousand times over the past 35 years or more, but with the Teos installed I was struck immediately by how easy it was to pick out individual instruments in the lead track, "Second Hand News."
I know this sounds like typical audio hyperbole, and I do want more time with them before coming to any definite conclusions. But so far, color me impressed.