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John,
I would say as perfect as Losmandy and Vixen can machine their gear. MaxPoint reports on a 100 star alignment that the non-orthognal issues are generally in the low arc seconds - say 5 - 15 arc seconds and accounts for this.
This is very different from tracking a star that is due East about 30 degrees above the horizon. After 10 minutes PEMPro saying the mount is your dead on for one scope whilst the other side-saddle mounted scope given exactly the same test reports the mount is 2 arc minutes off SCP. This reads like mirror shift on one of teh OTAs - the larger one - to me. Non orthogonal issues shouldn't be able to affect a test where the star is individually tracked - RA and DEC movement on the OTA is determined and arc seconds per pixel worked out by examining 10 second star trails then a star is tracked for 10 - 30 minutes at known bearing to compute drift correction required.
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