Interesting reading. Props for their pedagogical skills, even though some of it is marketing fluff ("no other AD/DA conversions are transparent"... yeah right). I do wonder a bit about all that DSP massaging of the signal and the drivers that they describe though. I'm very certain that DSP can be completely audibly transparent (I would never run non-DSP speakers these days). But there may also be artifacts introduced.
There are some people, including me, who seem to perceive the Kiis as not being completely "right", while not denying their impressive accomplishments also. And reports so far seem to indicate that people who have compared them often prefer the D&Ds over the Kiis.
Difficult to know for sure, as it's all sighted listening, and I'm not aware of any corroborating measurements (other than the cabinet resonances pointed to by John Atkinson). But I can't help but wonder whether there's something in their DSP implementation (or the active cancellation by the side drivers) which creates subtle artifacts of some kind.
EDIT: let me emphasize again that these are all sighted, subjective impressions though