I've actually use an antiailiased preview for some animations because I liked the way the preview looked over the rendered scenes. It doesn't hurt that it is ten times faster than fully rendering it. What I hate is when I buy a set and it looks horrible rendered but fine in the preview. I recently needed a TV news set and bought one from the marketplace here and it doesn't render.  Perhaps I can hijack this thread for a bit and see if anyone can tell me why it renders like this (top is highest setting on Firefly and bottom is antialiased preview):

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