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Digital shaft encoders really do not alleviate the need for guiding, as stars often show movement in Dec due standing atmospheric waves.
Drift from the refracted pole will vary from night to night with atmospheric density height, and I haven't seen a in imaging system yet that is immune to small focal plane shifts due gravitational bending moments changing with the camera's orientation.
I've also been intrigued to know what happens to a direct drive mount when the power fails?? With no gear to lock it in place I'd imagine things would get very interesting.
I'm sure they are a fine mount, but direct drive is not a feature I'd rate as essential.
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