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I too have used a 50mm finder to guide a small refractor, and have used OAG's, a nikon 500mm F/8 mirror lens (which is a mak cass), an 80mm F/5 refractor, a 102mm F/7 refractor etc etc.. Horses for courses as you say... Yeah, you probably could use the mak for guiding the SCT, however the best option in an SCT is using an OAG as you don't have to worry about the mirror flop issues, or the chance that your imaging primary will move more than the guiders primary etc... It can be done.. Im not saying it can't. Its just generally easier to eliminate all possible causes of frustration from the get go... All that being said, I used the 50mm F/4 finder + DBK31AU camera to guide my C11 @ F10 and got good results guiding the 2800mm focal length with just 200mm of guider focal length...
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