The only two minor things I would comment on unfavorably are 1: There does not appear to be any way to remove all of the the templates found in the extension, only thing you can do is to click on them and it directs you to buy them. I get the marketing angle, but it borders on annoying. 2. And this might be my error, but even after selecting to include all my users as being subscribed to the newsletters upon creating new - it did not work. I had to manually add them all.
Otherwise, a very clever and well designed extension.
Thanks for your work.