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Seeker you are very funny. You wanted a bite; well here it is. Yeah we might have less contrast and slower photographically but we have other advantages.
1. SCT's have a folded design, meaning the light path is folded. This means that it is smaller and therefore more compact and portable. You put your entire scope into the back of your car. You don't need to break it down into a many pieces for it to be transported. Just two. The tripod and the scope. Or in the case of a SCT on an EQ mount 3 pieces.
2. With the folded design we have greater focal lengths. 2500mm with a 2.5 powermate produces large image scale. This means our images of planets are bigger than any other scope. An SCT wins hands down here.
3. SCT designs are great for doing planetary work. The images are very sharp. Assuming you keep your collimation under control.
4. We don't get coma, nor do we suffer from chromatic aberration. Well, not like other scopes.
5. Easier to collimate, well relatively. We can't use a laser (believe me I have tried), but at least we only have three knobs to turn.
Yes while there are some down sides to owning an SCT, there are just as many reasons to own one. I don't agree with optical performance arguments. Yes they are slower, but you only have to look over the net and see that the majority of good quality DSO imaging is done by Cassegrain type scopes.
I like my SCT but wish for a RCX400. Another cassegrain.
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