It seems to cover all the bases but it might be too long. My experience is long write ups tend to intimindate or bore people & a significant number of people just opt out of the process when presented with very long complex texts.

Maybe you could shorten the section on "Why use UDFs to a paragraph or 2 & move the bulk of this discussion into a note or appendix at the end of the FAQ.

Part II is fine in my opinion.
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Jack