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I am quite happy at this point. There were a few early software and firmware niggles, some resolved, some easy to work around. There is a new revision of the motor control boards that reduces a tendency they used to have to oscillate slightly on the RA axis (Seemed to be as the motors went over each full step they would "Snap" to the full step where the micro steps in between did not) The park position issue listed above remains, I just selected one of the preset park positions instead and it parks perfectly every time.
On a still night with a 10"F4 newt on it using an OAG I regularly see 0.5" or better, it was running last night and PHD2 was reporting 0.36" total RMS using the PHD2 PPEC algo.
Once I worked out it's minor peculiarities, it just works.
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