The KEF's are smoothing out considerably. Out of the box the speakers sounded a bit bright, a little harsh, and the bass seemed to be a bit lacking. It was like the bass drivers needed to loosen up a bit... like they were being held back somewhat.
The vocal range started smoothing out within several hours, maybe ten or so. The bright edge is/has smoothed out nicely and is settling in with the KEF sound I love so much. The bass has really opened up. I certainly would not say lacking in any bass at all right now. It is like the drivers have a breath of fresh air and are now tightening up nicely.
I would say they are still breaking in. But the changes are fairly amazing so far and every day I enjoy the speakers more and more!