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Mechanically, the JMI focusers are good value for money. As Paul indicates, out of the box the motorised version isn't designed for astrophotography. If you want something to get you started, buy a JMI focuser with no motor and adapt a Robofocus to it. This will provide very fine focuser movements (0.005" steps) so you'll easily reach the critical focus zone of the SCT. RoboFocus can be a pain to use for visual use as its typically slow, so you'll use your course focus knob more.
Slight catch though. If you calibrate the robofocus, you need to leave the course focus knob alone as any shifts using course focus with through out the RoboFocus calibration measurements if you are automating focusing. At this stage I don't think you need to worry about this.
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