Dear @chauncey : By design seems to me that the Premium S is a little superior to the CS Port and real measurements confirm it where the speed stability of the PS is really superior that the CS Port. Both units use a quarz oscelator on its motot ps better implemented in the TecgDAS.
@sksos posted: " is a far more neutral sound .. ". I respect his opinion but almost has not a good foundation and not only because the measurements says can't be that way but because the resonance frequency between the MSL Platinum and the Safir tonearm ( that's the combination he shows in his virtual system. ) is to low at 5hz and we have to remember that the Safir is a four point unipivoted design.
This is the review and true/real measurements not did it by TechDas as the CS Port manufacturer specs but measurements by a third " hand " and this speaks a lot about that comparison between TTs. The other issue is that the TecgDAS is the Premium model where the Premium S is even better:
TechDAS Air Force III Premium Turntable | Hi-Fi News (hifinews.com)
Btw, servo in TT if it's well designed and with good quality excecution never is a problem with the sound we listen through it and we have to remember that all the cutting machines in the recording proccess comes with DD motors and all those motors control its speed by servo. That means that if we can't be aware of the recording used servo then it's no trouble at all. In several TTs the servo is only one characteristic of several other more important parts/characteristics in the TT designs: quality level in the excecution design could be the name of the game down there. Just my opinion but as with sksos y heavily respect the @mikelavigne opinion about.
Regards and enjoy the MUSIC NOT DISTORTIONS,
R.