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While I really like the SS2, from my experience the backlash in the ZWO is irrelevant in use. Some backlash compensation steps (I use 100 steps with my refractor) added to the focus setup and it functionally makes no difference in operation. I have used mine on three scopes, one with a crayford and two with R&P focusers with excellent results on all three.
I reckon there will be more to deal with inside the RASA than in the ZWO focus motor, unless Celestron have made the mirror behave a lot more predictably in the RASA 11 than in the regular SCT lineup.
The only thing I might say against it is that the internal temperature sensor reads consistently high, probably from being housed inside with the electronics, but temperature delta is what I use that for to trigger focus runs and it works fine in that regard.
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