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Hi Don,
I wholeheartedly recommend you to use an OAG with this scope; I had very good results using OAG with this scope and imaging with a 0.8 reducer.
At first I tried guiding with a 50mm guide scope, but had problems with flex. IMHO focuser and carbon fibre tube in ED80T CF are not that great and there is even a bit of movement between focuser and the tube. I noticed this issue with movement in two ED80T's. Optics are great though. I used epoxy cement to secure carbon tube in the focuser, and I am also using additional ring to hold the carbon tube firmly in place.
So, from my experience with this scope, OAG all they way :-)
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