The DOB tracking is fine.
Depending on your setup and alignment accuracy, of course.
Fine for observing that is, I would not suggest it meets the demanding standards of imagers.
And YES, under high magnification (eg planets) the tracking is noticeable and jerky, but that's not a problem for visual (IMHO). In any event, it is better than continually nudging. And its "hands free".
For low magnification, on DSO's, it appears seamless to me.
And on occasions I have left the scope for an hour to return and find it still centred. [albeit not always].
I was reasonably happy with mine, most of the time, right up until I sold it last month! (because the size and motors weight of the SW goto 12" was getting to my old back.)
In short: I'd have no hesitation in recommending a SW Goto DOB.
For the record: I am now using Argo Navis (push to; no motors) on a smaller SW, and I couldn't be happier.
