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Just for some info on my use.
I have found that most stars of around mag 9 will produce speeds of 1.7Hz. The fastest I have found so far was using mag 1.7 star and I tried speeds of 10Hz. I could have gone faster but did not try. I am told that the AOX can operate at 30Hz. Which is very fast but not sure if this is really practical for long focal length imaging. There are not that many bright stars that close to lots of objects.
I have found that guiding at 1.7 Hz is still better than native guiding at 1-2 second exposures. Good seeing makes for very tight star profiles and sharp detail. Poor seeing produces sharp detail but not as sharp as in good seeing but still better than not using this type of guiding. So most of the correction is likely mount related and some seeing correction. A word of warning though. You really need to have your guiding really nailed for this to work. I spent several nights working on honing the guide settings both min and max moves. Not only that PEC and PA should be fully corrected and as close to the pole as possible. Mount corrections should be minimised to produce good results.
I can confirm that the AOX is a voice coil magnet Drive x 4 (two in each axis). I have seen inside of these units and have seen one working in exercise mode.
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