Judging from Stereophile's brief review, the Centroid's design features apparently have been rewarded in sonic terms; two distinct positive characteristics are low noise floor and accurate deep bass. Here's what Brian Damkroger has to say in the review in June 2010 issue.
"As I listened more, the characteristics that made the Centroid sound so different became obvious. First and foremost, it had no noise floor - not a dramatically reduced noise floor, but NO noise floor.... A second distinct and obvious characteristic of the Centroid's performance, and one new to me, was how accurately it reproduced the tonal and dynamic elements of deep bass notes."
Unipivot arms tend to sound quiet to me so I am not surprised, especially since the Centroid opted for a classic unipivot design with no secondary bearings (the chance of bearing chatter). And quality deep bass is something new in the unipivot genre as it traditionally have a less impactful bass due to the azimuth instability so I have to guess the centroid concept overcomes that. Very promising indeed.
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