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My SVX80 worked well with a guidescope, and pretty well with the inbuilt guider on my mount, but I don't reckon I would want to try it with anything less solidly mounted, or much over the 480mm focal length. The inbuilt guider guides down to about 0.8" on decent nights, I don't think it is reasonable to expect much better out of a 120mm focal length guider.
I use an OAG on my C925 and it guides down to about 0.6" on my old Orion Atlas. I bought the QSY OAG-M as I had rigidity issues with the Orion thin OAG I used before where the QSY is much more solidly constructed. With the ASI290MM mini camera I have never actually had an issue finding a guide star though there have been times PHD2 has picked about the only star I could see in the field.
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