Gday Andrew
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I guess you could call it 'real time error correction' instead of periodic. Maybe RTEC is a suitable acronym?
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Its not really that either, its more like RPTEC ( Real "Part Time" )
All any of these systems do is try and make an encoder go at a certain rate. They dont address how the OTA flexes and how the sky tracking rates change. By having an encoder on the final axis, it eliminates the geartrain ( and hence any teeth errors ) from the feedback loops, but it cannot affect all the other downstream errors.
Its certainly a big step up from a system where a cheap encoder is on the motor, but there are still a lot of other errors that it cant deal with.
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Direct drive: no gears, no PE
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Also very high price and still doesnt address all the other errors mentioned above. Its horses for courses.
Be good to see how the technology evolves, and a reduction in moving parts that have to be aligned would be nice, but it will still need a good encoder feedback system.
Andrew