While I can not compare directly with the DX3 model, I have had a JMI DX series and a Moonlight...the Moonlight is hands down better...smoother and just "felt" higher quality.
The JMI IMO is not quite in the same league as the Moonlight...as suggessted, you might be better served with a GSO Crayford focuser or jump up to the Moonlight/Feathertouch category...
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