However, in spite of what the developer has stated, you CANNOT have more than one list sign up on the same page.
Is this is a problem due to the AJAX? Who knows, but I cannot say because requests for information from the developer have gone unanswered.
One list on any one page - for us, this is a serious limitation. Combined with the lack of response from the developer gives this extension a blow par score.
Probably have to buy a commercial extension if you want a really integrated solution