Nick,
SharpCap’s pola alignment display was giving error values between 8″ and 15″ as I finished tightening my azimuth and elevation locks. This included a correction for the refracted pole at my latitude. The ambient temperature was around 10 C. Of course, tapping and nudging the mount / ‘scope showed how these values could change.
I fully expect it would give different values if I was to test it on a frequent basis. I don’t do long-exposure astrophotography and I’m not chasing professional observatory alignment standards, just content that it’s reasonably well polar aligned and is doing the job of finding my 30′ star fields.
Alex.