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I've used OAG's in a 102mm F/7 refractor, an 8" F/6 Newtonian, an 11" SCT and in an 8" RC... I think they are great tools to have, and I've rarely found an area of sky where I can't frame an image exactly as I want and have the guider find a usable star right there.. The trick is to have a very very sensitive guide camera. The QHY5/Orion SSAG will work in most of the sky.. I've only ever run into trouble twice using the QHY5 and OAG. I love to only need one scope on the mount when I image, as for setup and balance purposes, the OAG is a fantastically simple piece of equipment. Not only that, but it greatly reduces the overall weight on the mount, and ensures that you will not be plagued by flexture..
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