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I have been using PEMPro for a few years now - on a permanently mounted rig. Often it is good, sometimes it reports bizarre misalignment.
I align using an SCT - so I wonder how much mirror shift / flop is altering the PEMPro advice.
I note that PEMPro for me in the Southern hemisphere seems to inflect the movement corrects required.
I have had great success using PHD with DEC guiding disabled to drift align.
Finally I note there always seems to be great disagreement between all of:
1. PEMro using multiple 30 minute runs
2. Tpoint using say 130 stars well placed
3. PHD using drift alignment
4. Astrotortilla using plate solves
You would think a majority agree! I would guess my polar alignment to the Refracted South Celestial Pole is between 30 - 120 arc seconds - I can just never get all or even most of the above software to agree and the mirror shift in my SCT makes further improving my polar alignment challenging!
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