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It was Sansui that first pioneered the idea of counter-rotation in their XR-Q7 and XP-99 direct drive turntables from the early 80's, which featured the Silent Synchrotor system. It was only implemented in their motor, if not the platter, so there's an extra motor below the top motor rotating in reverse to cancel vibration. It'll be interesting to see how this is incorporated in a belt-drive turntable. From your listening impression looks like it's working well. The Kronos has a extra pulley equidistant to the motor pulley to balance out side torque of typical belt drive designs. Good idea.
You can read about Sansui here:
http://www.classicsansui.net/Turntables.htm#XP-99
http://www.hifichoice.co.uk/page/hifichoice?entry=innovative_hi_fi_47_laboratory