AO8/MOAG/Rotator are probably heavier than the Orion unit, and definitely has more backfocus requirement... but as Marki said, the AO8 setup can only be used on SBIG cameras, so comparing them isn't really worth while..
It is a good setup, all in one. I just wont put any faith in it until I've seen results. The SX unit has been tried and tested. As has the SBIG setups. As you say - no word on the orion AO at all, aside from marketing literature..
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