Keith

>I've seen a number of admonisions against using
>FormSets, but no good indicator as to when they
>*should* be used.

IMO, there is no good reason to use them since version 5.0. (And I +liked+ formsets. :)

>Does anyone have a good rule of thumb or a technical
>reason that FormSets help improve performance?

AFAIK, they don't improve performance, maintainability, accessiblity, or scalability (can you tell I'm studying for the exams? :).