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I am definitely no expert on guiding but I find the OAG works fine on both the 100mm refractor and the C8 with a reducer. Guiding for five minutes with poor PE and poor PA seems to work surprisingly well with the most basic of setup.
The problems arise without the reducer on the SCT which seems to reduce both brightness and field of view, so the number of available stars . The other problem is the flaky nature of the zwo USB connections .
I would definitely get a guide camera better than a ZWO 120 and start with the reducer, but the celestron OAG with good focussing , all required adaptors and rotating connectors works well on an SCT.
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