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I get a gorgeous diffraction pattern on bright stars in my 9.25 Edge SCT. Like anything, there are good and bad ones.
Most of the best planetary imaging I have seen comes from SCTs as well, so they aren't as bad as many people seem to think, especially if cooled correctly and collimated properly.
A poorly cooled, badly collimated SCT will give crappy views.
Having said that, Wavytone is pretty much on the money with his breakdown, but it looks like you have a permanent setup and a monster mount, so the portability arguments are irrelevent in your case.
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