I used this successfully to get data out of Ning and am very grateful for that. I found it unnecessary to go all the way to convert the forums into BBpress forums as I was using WordPress with Buddypress as an intermediate step en route to Kunena.
Attachments are not handled and needed to be added manually to my new setup. This could be a showstopper if you have a great many.
A possible issue to watch out for -- because correcting it later (by manual edits to database tables, only if you know how and care to have things in exactly the original order) can be involved -- I came up one topic and thread short. It was exported ok from Ning but wasn't imported (a possible starting from 0 or 1 error; perhaps something else). It was the first topic in the old forum.
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