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I have used a short tube 80 + orion ssag on a c9.25 with ADM mounting bar, with phd, and it worked ok. Never a problem finding a guide star, complete freedom to do whatever you like to the main camera in terms of reducers, filters, etc.
I have also used an off axis guider. lt was slightly better IF there was a reasonable guide star nearby, but much more hassle if I wanted to change the optical train.
Both are viable solutions.
For what it is worth, I now mostly use the ssag with a homebrew converted 50mm finder guidescope.
-Ivan
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