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From my experience with SCT you need to have the collimation spot on to get nice sharp images.
Alot of people have these scopes and they are not collimated very good and the image performance suffers. So make sure the defraction rings on say a mag. 1 or 2 stars are nice and round on either side of focus. Just defocus the star a very little bit with say a 9mm eyepiece and you should see the onion rings.
When I first got my Meade 12er its views were excellent, but you should check the collimation all the time, I can easily see great detail through my scope when it is spot on with the colimation.
I remember a friend of mine saying up at Astrofest a few years back he went around a checked most peoples scopes both Newt's and SCT and he found most were out a little and some a lot.
After re-colimating the bad ones for these people they had a very nice night at the eyepiece compared to the night before.
Regards Matt.
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