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My understanding (and this may well be wrong) is that many mounts use "modelling" to improve pointing accuracy by compensating for slight inaccuracies in polar alignment, measured during the "alignment sequence". It's nothing like what Tpoint does, but it helps.
There are many posts on the AP Yahoo Group that mention the lack of modelling in the AP controller. It may be added to revisions of the firmware...
I'm very happy with the AP mount, it's accuracy is fine for my current imaging demands - at Duckadang, the objects were always within the camera's field of view (DSLR at 600mm focal length) - but I'll have to learn what to do as I try to work at longer focal lengths.
DT
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