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Servocat and Dob driver are very different beasts.
Servocat you will need to spend an extra $1000 for encoders and Argo Navis - if you dont have them the whole rig will be no change from $4K.
Dob driver is an old stepper drive system where you train the drive to go at a suitable rate for where you are pointing and slew rate is relatively slow, but I used one on a few different scope and panning around the Moon is fun and they are good for planetary viewing but overall a pretty dated system.
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