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James,
You'll only need a FR if you want to image at a shorter focal length than the native length of the scope. It does make the scope more versatile and gives you the option of a faster focal ratio. I have used an Astro-Physics TV27PH focal reducer with my RC10 and it works well. Other have used the CCDT67, also from A-P, and appear to like it.
I find the RC10 is OK without a flattener using a KAF8300 sized chip (17.96mm H x 13.52mm). There definitely is some field curvature but it's not horrid. I think if you went any bigger you would want a flattener. I tried using my STL11K camera (KAI11000M full frame 35mm size sensor) and it was awful in the corners. The vignetting was severe too.
Cheers,
Rick.
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