Troy, When I get my ST-8300M I'll do a comparison to the QHY8 and the Orion SS Pro, I have no experience with the QHY9... I dare say the difference will be that the ST-8300 won't suffer the same teething issues as the QHY9 did.. All the QHY9's issues have been resolved, however I think that the ST-8300 will have been more rigorously tested to ensure out of the box performance... Its just how SBIG do things..
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