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I think the starshooter is essentially the same as the QHY5, except is about $80 more expensive.
I found more flex in a side byside arrangement than on top. Flex at that FL wont be a problem anyway, and they are both refractors, ie heavy at the front end. Its when a refractor is used for guding on an SCT that it occurs more, an SCT is heavy at the back, so they sag differently.
FL of the guide scope used to be more important, but now adays guide software corrects to subpixel resolution. I guide an SCT at over 2m FL with the ST80 ,up to 20min exposures, with success, (although at 20mins its a struggle, 10mins is fine). With an ED80 its a no brainer, no problem there.
You dont need a filter for guiding in mono at all, chromatic abberation is irellavent for guiding.
The ST80 is just so cheap and light, its pretty much an unbeatable standard.
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