What is the difference btwn. Versions?

Does anyone know the difference? Is it worth buying a used rev a or b or should I just buy new.

A new one has an Apple warranty. A used one does not.
My old Rev A has been working fine now for nearly 2 years, but if you like the reassurance of having a warranty, consider a new one.
Whichever you buy, ask for a demonstration of the exact unit you will take home, connected to YOUR Mac if practicable. That way you will KNOW it works for you. (How to test your iSight to ensure it is functional)

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