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I think it depends on focal length and the type of scope. A mirrored scope may be more problematic than a refractor.
A short focal length scope like an FSQ is a lot easier but still can have problems.
A guide scope on a 3 metre CDK can work but now round stars are not guaranteed and results vary from elongated stars to slightly eggy and occasionally round.
So if you are planning on upgrading to a longer focal length scope you may get different results.
But of course if what you are using is working there is no need to do anything.
I have used a Vixen 95 VMC scope as a guide scope on my 17 inch CDK when I was unable to use an OAG due to using the reducer with its practically no backfocus. I got round stars often and other times they were not perfectly round.
Greg.
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