They usually require dew sheilds during cooler months because the corrector lens will dew over quite fast. If you decide to do astrophotography or CCD imaging you will need a T-Adapter and focal reducers and such. I have been to many star parties with people who have SCT's and they love them. Not all SCT's perform the same. Some folks buy these first, if you do, make sure when you look at the price make sure what comes with it.
Many stores only sell the tube assembly only.
Or they sell the scope and mount, but nothing else including eyepieces and such.