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I am using an Orion Thin OAG on my C925 with a 0.63 reducer on an Orion Atlas Pro (AZEQ6 painted black) The challenge is getting the spacing just so with the reducer so that you can get decent guide stars and the imaging and guiding cams in focus together.
You also need a good guide camera, I am using an ASI290mm mini. I tried with an old Orion SSAG guide camera I had but it just was not sensitive enough so I sold that to another IIS'er with an Orion ST80 scope as a guider package. Hopefully it is doing the trick for him.
Even with my reducer and current spacing which gives about 1500mm focal length getting the guiding happening nicely is a challenge. I am still working on it after a couple of weeks, just chipping away and improving it bit by bit. But the mirror shift inherent in the SCT is going to make a guidescope a frustrating thing.
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